InboxKit is an all-in-one infrastructure platform that automates domains, mailboxes, warmup, DNS, and deliverability for outbound teams. You can buy domains, create mailboxes, warm them automatically, validate emails, run inbox placement tests, and export mailboxes to sequencers—all without touching DNS or technical setups.
No. InboxKit handles all DNS, SPF, DKIM, MX, and DMARC automatically in the backend. You simply add a domain or purchase one, create mailboxes, and start warming or exporting them. Everything else—records, propagation, configuration—is fully automated.
Just sign up, create a workspace, and head to the Domains tab. You can either buy domains directly through InboxKit or connect your existing ones. Once active, create mailboxes, warm them up, and export them to outreach platforms like Smartlead or Instantly.
Yes. Go to Domains → Existing Domains, add your domain, and update the nameservers at your registrar. InboxKit will automatically configure DNS records once the domain propagates (usually 24–48 hours) and becomes active.
Full propagation typically takes 2–48 hours depending on the registrar and DNS network. During this period, the domain may show as inactive. Once complete, InboxKit automatically verifies and activates the domain.
No. InboxKit auto-generates and configures all DNS authentication records in the backend once a mailbox is created. You never need to manually copy records or edit DNS settings unless explicitly requested by support.
After your domain becomes active, go to Mailboxes → Add Mailbox, choose Gmail or Microsoft 365, and InboxKit will create the mailbox automatically. No external subscription or admin setup is required—everything is included.
You can create 1–5 mailboxes per domain. This maintains optimal deliverability and prevents reputation damage that occurs from overloading a single domain with too many accounts.
Pre-warmed mailboxes come with 3–4 weeks of warmup already completed, allowing you to start sending sooner. Since reputation depends on the address, changing the username resets warmup—so a fresh warmup cycle will start automatically.
Warmup gradually builds sender reputation by simulating natural sending patterns and engagement across inbox networks. InboxKit automatically increases volume, reads, replies, and interactions until your mailbox reaches a healthy reputation—no setup is needed.
Yes. InboxKit integrates natively with Smartlead and Instantly. Add your sequencer in Sequencers, then export mailboxes in Exports. Credentials, SMTP/IMAP, and login details are auto-generated and synced.
Inbox Placement Tests show exactly where your emails land—Inbox, Spam, or Missing—across major providers like Gmail, Outlook, Workspace, and Microsoft 365. This helps you diagnose deliverability issues before launching campaigns.
Yes InboxKit support Cloudflare domains now.
InboxKit uses a wallet-based credit system where 1 credit = $1. You use credits to buy domains, mailboxes, email validations, inbox placement tests, and pre-warm inventory. Credits never expire and give you full flexibility.
Mailboxes typically become active within 2–6 hours after creation. Warmup will begin automatically, and reputation improves over 4–8 weeks depending on sending volume. Pre-warmed inventory activates instantly.
16. How do I add a new domain to InboxKit?
Go to Domains → Add Domain, enter your domain, and update nameservers at your registrar. Once the nameservers propagate, InboxKit automatically configures DNS settings like SPF, DKIM, MX, and DMARC for you.
Yes. InboxKit lets you purchase domains with one click. When you buy through InboxKit, DNS, warmup, and mailbox creation are all automated—no manual configuration or external dashboard access required.
This usually means nameserver changes haven’t propagated yet. DNS propagation can take 2–48 hours depending on the registrar. Once complete, the domain automatically switches to “Active.”
Any registrar that allows nameserver changes works—such as Namecheap, GoDaddy, Dynadot, Hostinger.
No. InboxKit automatically creates and manages your domain’s DNS stack. As soon as the nameserver changes propagate, all required authentication records are configured for you.
InboxKit recommends 1–5 mailboxes per domain to maintain deliverability. Overloading a domain with too many accounts significantly increases the risk of spam hits and reputation drops.
If you manually modify or delete DNS records at the registrar, it may break mailbox creation and deliverability. InboxKit will alert you, and you’ll need to restore InboxKit-managed nameservers for full automation.
Domains are workspace-specific and cannot be shared across multiple workspaces. However, mailboxes from the same domain can be exported to multiple sequencers if needed.
No. Domains are fixed once added. If you need different naming conventions, you’ll need to add or purchase a new domain and migrate mailboxes accordingly.
Yes. InboxKit continuously monitors domain health, warmup performance, sending limits, DNS authentication, and deliverability signals. Any issue—like failed DKIM or rising spam—appears inside the mailbox-level insights.
Nameserver control allows InboxKit to fully automate mailbox creation, renewals, warmup, authentication, and domain safety. Manual DNS is error-prone, slows propagation, and breaks automation—so InboxKit doesn’t rely on it.
No. Since InboxKit takes full DNS control, hosting a website on the same domain is not recommended. Instead, use sub-domains for websites and keep sending domains exclusive to outreach.
InboxKit supports most popular TLDs like .com, .co, .io, .us, .live, .email, etc. For outreach deliverability, .com and .co domains tend to perform most consistently across providers.
Yes. Domains purchased through InboxKit renew automatically using wallet credits. If credit balance is low, InboxKit sends alerts so renewals are never missed—preventing email downtime.
Inside Mailboxes → Warmup, you can view individual mailbox reputation, daily interactions, and completion percentages. Since domains warm through mailbox reputation, consistent warmup and low bounce rates improve domain health over time.
31. How do I create a new mailbox in InboxKit?
Go to Mailboxes → Add Mailbox, select your domain, choose Google Workspace or Microsoft 365, and fill in the username and display details. InboxKit will automatically provision the mailbox, set up DNS authentication, and begin warmup once active.
Google Workspace mailboxes typically activate within 20–40 minutes, while Microsoft 365 mailboxes may take up to 1–2 hours depending on provider load. Once active, credentials and warmup status will appear inside the mailbox panel.
Yes, you can update the mailbox’s name, username, or profile photo under Mailbox → More → Settings. However, if you change the username, a fresh export is required and warmup reputation may partially reset for that mailbox.
Changing the username resets sender identity, which can weaken existing warmup history. InboxKit automatically adjusts and restarts warmup progression to rebuild reputation for the updated mailbox identity.
Open Mailbox → More → Credentials to view your login email, password, and 2FA code. Use these to sign into Gmail (mail.google.com) or Outlook (outlook.office.com). Avoid enabling 2FA inside Gmail/Outlook to prevent sequencer sync issues.
This status appears when the provider is still provisioning backend resources. It's normal for mailboxes to remain pending for 30–90 minutes. If pending exceeds several hours, rechecking DNS or retrying creation may be necessary.
InboxKit provides error details within the mailbox card. Most failures relate to DNS propagation or provider throttling. Fix the issue and click Retry Setup to rebuild the mailbox automatically without additional charges.
Yes, go to Mailbox → More → Settings → Delete Mailbox. Deletion schedules the mailbox for cancellation at the end of the billing cycle, ensuring you get the full value of the paid period before removal.
Deleting a non-admin mailbox frees up its slot on the domain. However, deleting the admin mailbox permanently breaks the domain setup and deletes the entire domain configuration—this cannot be undone.
Warmup sends controlled, incremental interactions across a trusted inbox network—mails sent, opened, replied, and categorized as safe—to build sender reputation. InboxKit manages the entire process automatically with zero manual action needed.
Yes. Each mailbox has its own warmup switch that can be paused or resumed anytime. Pausing warmup halts daily interactions but does not impact existing reputation. Resuming continues from the current reputation level.
A full warmup cycle typically takes 4–8 weeks depending on your sending goals. However, light sending can begin after about 10–14 days as long as sending volumes remain low and gradually scaled.
Cold domains have no sending history, making providers more likely to flag emails as spam. Warmup builds trust with Gmail, Outlook, Workspace, and M365 by creating positive engagement signals, ensuring your campaigns land in Inbox rather than Spam.
Yes, InboxKit supports simultaneous warmup for all mailboxes under a domain. Each mailbox builds its own reputation while also collectively strengthening the domain’s overall trust level.
This happens when filters are not set correctly. Identify warmup patterns (often generic conversational emails) and add filters or rules to isolate them. Warmup emails are safe but may clutter your inbox if not filtered properly.
46. What is a Sequencer connection in InboxKit and why is it needed?
Sequencers like Smartlead, Instantly, and Lemlist require mailbox credentials to send outbound emails. InboxKit connects directly to these platforms so your mailboxes can be synced automatically without manual SMTP setup or copy-pasting credentials.
Go to Sequencers → Add Sequencer, choose your platform, and enter the required login credentials or API key. Once verified, the sequencer appears under your connected integrations and becomes available during exports.
Some platforms (like Instantly and Smartlead) require workspace-level authentication. InboxKit stores this securely and uses it to push mailbox credentials during exports so they sync instantly with your sending platform.
An Export sends selected mailboxes from InboxKit to your sequencer with correct login, IMAP/SMTP details, and configuration settings. This process installs the mailboxes inside your sequencer so they can begin sending campaigns.
Go to Exports → Create Export, choose a sequencer, select mailboxes, and click Create Export. The export will run in the backend, and status will show as Queued, Processing, Completed, or Failed.
Exports usually complete within 10–30 minutes, depending on the number of mailboxes and sequencer load. Larger exports may take slightly longer due to authentication checks and mailbox initialization.
Exports fail when sequencer credentials are incorrect, 2FA is enabled, the sequencer subscription is inactive, or IMAP/SMTP is blocked. Fixing the root cause and re-running the export typically resolves the issue.
Yes. Sequencers must have 2FA disabled to allow InboxKit to sync mailboxes automatically. If 2FA stays enabled, mailbox login fails and the export cannot complete successfully.
Yes. Any changes to username, name, warmup status, DNS, or credentials require a fresh export so the sequencer receives updated mailbox information. Without re-exporting, your sequencer may display outdated data.
Yes. A mailbox can be connected to multiple sequencers simultaneously. Just run separate exports for each platform. Note that warmup and sending limits apply universally across all tools.
Auto-Export automatically pushes new mailboxes to your sequencer as soon as they become active. This removes the need to manually trigger exports and ensures your mailbox pool is always synced with your sending tool.
A mailbox may be incompatible if created on a provider not supported by the sequencer (e.g., Outlook mailboxes on certain Gmail-only sequencers). InboxKit will filter and show only compatible accounts during exports.
Go to Sequencers → Manage, where you can update workspace names, passwords, API keys, or remove the sequencer entirely. Any changes should be followed by a new export for syncing mailboxes correctly.
No. Removing a sequencer affects only the integration. Mailboxes remain active in InboxKit, and you can reconnect or export them to another platform at any time.
In the Exports tab, check the export timeline. A green “Completed” badge confirms success, and your mailboxes will now appear inside your sequencer. If status shows “Failed,” click into the export to view specific error details.
61. What is Email Validation in InboxKit and why is it important?
Email Validation checks whether email addresses in your list are deliverable, risky, catch-all, or invalid. Validating your list before sending prevents bounces, reduces spam flags, and protects domain reputation, especially during volume increases.
Go to Addons → Email Validation, upload a CSV file, map the email column, and click Start Validation. InboxKit processes the file, classifies each email, and lets you download results in multiple formats once complete.
InboxKit uses a credit-based model where 1 credit = 1,000 validations. The system automatically calculates cost before starting the validation, and credits are deducted only when validation begins.
Valid emails are safe to send; Invalid emails will bounce; Catch-All domains accept everything but may still bounce; Unknown results occur when the receiving server blocks verification. These labels help you filter lists for maximum deliverability.
Small lists validate in seconds, while larger files (10,000+ rows) may take a few minutes. You can monitor progress in Validation History, and InboxKit processes validations even if you leave the page.
Yes. Completed results can be downloaded in CSV, XLSX, TSV, or PDF formats. Each file includes categorized email statuses so you can import clean lists into your outreach tool without further formatting.
Inbox Placement Tests show where your email lands—Inbox, Spam, Promotions, or Missing—across Gmail, Outlook, Workspace, and Microsoft 365. This helps diagnose domain and message-level deliverability issues before launching campaigns.
Go to Addons → InboxPlacement → Start New Test and follow the 4 steps: Select Mailboxes → Choose Frequency → Message Settings → Review & Confirm. Once submitted, the status updates to Processing and then Completed.
Pricing is simple: $0.05 per mailbox tested. Whether you test against one provider or all provider types, charges apply per mailbox, and payment is deducted from your wallet credits.
Most users run weekly tests to maintain stable performance, especially when increasing volumes. Running a test before major campaigns helps identify issues early, saving domain reputation and preventing sudden spam drops.
“Missing” means the receiving server never delivered the message to Inbox or Spam. This may occur due to throttling, reputation issues, a new domain, or a message that triggered provider-level filtering.
InboxKit assigns a score from 0–10 based on inboxing, authentication, provider performance, and content safety. Scores above 8 indicate strong deliverability, while scores under 6 may reflect authentication or content issues.
Yes. In Step 3 of the test setup, you can add your own subject and message body. Using real campaign-style content gives a more accurate representation of how your actual emails will land.
InboxKit sends test emails with realistic timing to avoid artificial patterns. Based on your frequency settings and sending interval, tests may take a few hours to finish. This ensures accurate deliverability data.
Check your warmup status, authentication records (SPF/DKIM/DMARC), email content, sending volume, and list quality. You may need additional warmup cycles, content restructuring, or validation. Running a follow-up test can confirm improvements.
76. How does the credit system work in InboxKit?
InboxKit uses wallet-based credits for purchasing mailboxes, domains, validations, warmup, and inbox placement tests. 1 credit = $1, and credits deduct instantly when you buy or renew services. Credits never expire and offer complete spending flexibility.
Go to Settings → Billing → Add Credits or use the top-right “Add Credits” button on the dashboard. Enter the amount, proceed to Stripe checkout, and credits are added instantly once payment succeeds.
Yes. Enable Auto Top-Up by setting a minimum balance and refill amount. When credits drop below your threshold, InboxKit automatically charges your saved Stripe payment method and refills your wallet.
InboxKit processes payments securely through Stripe, supporting credit/debit cards, Apple Pay, and country-specific payment methods. Billing details and invoices can be managed any time via the Stripe Customer Portal.
No. InboxKit follows a strict no-refund policy for credits, subscriptions, mailbox purchases, and domain registrations. Credits remain available for future use but cannot be withdrawn or refunded to your bank.
Subscriptions are monthly/quarterly/annual plans that provide mailbox slots and automation limits. Credits are pay-as-you-go funds used for domains, add-ons, prewarm inventory, and mailbox renewals outside your subscription capacity.
Yes. Subscriptions renew automatically on your billing date. If your default card fails, InboxKit retries multiple times and sends alerts so you can update payment details before service disruption.
All invoices and receipts are available at Settings → Billing → Open Stripe Portal. Here, you can download PDF invoices, update payment methods, and manage billing addresses.
Open the Stripe Billing Portal through InboxKit’s Billing Settings. You can add/remove cards, set a default payment method, and update your billing address without affecting your existing subscription.
Yes. Upgrades apply immediately with prorated charges, while downgrades take effect at your next renewal. InboxKit shows the pricing difference before confirming a plan switch.
Go to Settings → Billing or open the Stripe Portal and choose “Cancel Subscription.” Your plan remains active until the end of the billing cycle, and no further renewals will be charged.
Mailboxes linked to subscription slots remain active until the billing period ends. After that, you must either top up credits to renew them manually or they will be scheduled for cancellation.
No. Domain registrations are processed instantly through accredited registrars, making them non-refundable. This applies to both new domain purchases and renewals processed via wallet credits.
If you bought mailboxes using credits (not subscription slots), InboxKit deducts renewal charges monthly from your wallet. Ensure sufficient credits; otherwise, mailboxes may be suspended until you top up your wallet.
If renewal charges cannot be deducted, mailboxes, warmup, and associated automations may pause. InboxKit sends alerts beforehand, giving you time to add credits and avoid service interruption or deliverability issues.
91. What is Pre-Warm Inventory in InboxKit?
Pre-Warm Inventory consists of domains and mailboxes that have already undergone 3–4 weeks of warmup. These mailboxes come reputation-ready, allowing you to start sending outreach immediately without waiting for traditional warmup cycles.
Regular mailboxes need 3–8 weeks of warmup to reach safe sending quality, while pre-warmed mailboxes arrive with established trust, higher inbox rates, and sending consistency. This makes them ideal for fast deployment and high-volume teams.
Go to Prewarm → Add to Cart, customize mailbox names, add redirect URLs, and complete the checkout using wallet credits. Your pre-warmed mailboxes appear in the Mailboxes section within 5 minutes and are ready for sending.
Pre-warmed assets have fixed provisioning, warmup, and infrastructure costs that Stripe subscriptions cannot support. Credits enable instant, on-demand purchasing without recurring billing dependencies or subscription restrictions.
Yes, but changing the username resets the warmup reputation. Since mailbox trust is tied to identity, modifying it forces the system to rebuild sender reputation through fresh warmup cycles.
Each pre-warmed domain includes 3 fully warmed mailboxes. This structure ensures optimal distribution of sending volume and protects domain health by preventing overuse on a single domain.
No. Pre-warmed domains have a fixed structure of 3 mailboxes based on optimal warmup and deliverability guidelines. Adding new mailboxes would break warmup balance and negatively affect the domain’s trust profile.
They don’t require warmup to begin sending, but InboxKit recommends continuing warmup for 6–12 weeks in parallel with outreach. Continuous warmup reinforces trust and supports higher sending volumes over time.
You can begin sending immediately after purchase. However, InboxKit suggests following a controlled ramp-up strategy to maintain strong reputation—starting with 20–40 emails/day and scaling gradually over the next few weeks.
Yes. Pre-warmed mailboxes are ideal for teams aiming to start outreach quickly with stronger inbox placement. Still, avoid sudden spikes in sending volume; gradual scaling remains essential to protect deliverability.
It’s the URL visitors see when accessing your domain directly. Redirects improve domain trust signals and prevent landing-page errors. You can set or update the redirect during purchase or later in domain settings.
No. Redirect URLs do not affect warmup, sending quality, or spam filtering. They serve primarily as a landing fallback for users who visit your domain manually.
Not recommended. Pre-warmed domains are optimized solely for email outreach. Hosting websites or adding extra DNS services may disrupt DNS automation and weaken deliverability signals.
Warmup history remains baked into the mailbox as long as sender identity stays unchanged. If you avoid renaming or making drastic configuration changes, the reputation stays stable and accumulates over time.
If credits aren’t available for renewal, mailboxes are scheduled for cancellation. Once expired, the historical reputation is lost, and reactivating the mailbox later would require starting warmup from scratch with a new domain.
