Which mailboxes can I connect?
Any mailbox you own that offers SMTP and IMAP: Gmail and Google Workspace with an app password, Zoho, Fastmail or your own host. Microsoft 365 mailboxes wait for Microsoft sign-in, which is coming soon, because Microsoft no longer accepts passwords for IMAP. One-click Google sign-in is coming soon too.
By Naman Jain, founder of SealrepPublished 3 October 2026Last reviewed 12 October 2026
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What connects today, and what each needs.
| Topic | How it connects | What you need |
|---|---|---|
| Gmail and Google Workspace | SMTP and IMAP with an app password | 2-Step Verification on the account, and IMAP on in Gmail settings. A Workspace admin can switch app passwords off.[1] |
| Zoho Mail | SMTP and IMAP | IMAP on in Zoho settings, and an app-specific password. EU and India accounts use their own hosts. |
| Fastmail | SMTP and IMAP | An app password with IMAP and SMTP access. |
| Your own mail host | SMTP and IMAP | Its server details. Both must use SSL or STARTTLS: plain connections are refused. |
| Microsoft 365 | Not yet | Waits for Microsoft sign-in, which is coming soon. |
Sealrep does not sell or warm mailboxes, and it does not set up your domain. It checks your SPF, DKIM and DMARC records, and a campaign cannot start while SPF or DKIM is missing.
Why Microsoft 365 has to wait.
Sealrep reads replies over IMAP. Microsoft has switched off password sign-in for IMAP in every Exchange Online tenant, and says no one can switch it back on[2]. Passwords still work for SMTP AUTH where a tenant allows it, but at the end of December 2026 Microsoft switches that off by default for existing tenants and makes it unavailable for new ones[3].
So a Microsoft 365 mailbox needs Microsoft sign-in. It is built in Sealrep and waits on Microsoft's approval of the app. Until then, use a mailbox on another provider.
What connecting a mailbox lets Sealrep do.
- Send the emails you approve, and file a copy in your Sent folder when your server does not do it by itself.
- Read new mail to find replies, bounces and out-of-office notes to emails Sealrep sent. Messages are read without marking them as read.
- Keep only mail that belongs to one of Sealrep's threads. Everything else is checked in memory and dropped, and connecting never imports your old mail.
- Removing a mailbox deletes its sign-in details and anything of it that is not part of a live thread.
Coming soon: one-click sign-in.
- Google sign-in instead of an app password. It waits on Google's review of Sealrep's mail access.
- Microsoft sign-in for Microsoft 365 and Outlook. It waits on Microsoft's approval of the app.
How many mailboxes each plan connects.
| Plan | Mailboxes | Daily sending |
|---|---|---|
| Freelancer | Up to 3 | Each one on its own 21-day ramp, up to 25 a day |
| Founder | Up to 10 | Each one on its own 21-day ramp, up to 25 a day |
| Agency | Up to 10 per client | Each one on its own 21-day ramp, up to 25 a day |
Read live from the app’s price list. Prices and every plan are on the pricing page.
Where every fact comes from.
- [1]Google Account Help, Sign in with app passwords read on 2 October 2026
- [2]Microsoft Learn, Deprecation of Basic authentication in Exchange Online read on 2 October 2026
- [3]Microsoft Exchange Team, Updated Exchange Online SMTP AUTH Basic Authentication deprecation timeline timeline of 27 January 2026, read on 2 October 2026
Spot a mistake? Email hi@sealrep.com and we will correct it within 5 business days.
Questions people ask. Answered straight.
how many mailboxes can I connect?
Your plan sets the number, shown in the table on this page and on the pricing page. Each mailbox has its own ramp and its own daily cap.
should I send from my main website domain?
Sealrep allows it but shows a warning, because problems with cold email then reach the domain your normal mail uses. Many senders use a separate domain they own. Sealrep checks either one before a campaign starts.
will Sealrep read my whole inbox?
No. It keeps only replies, bounces and auto-replies to emails it sent. Other mail is checked in memory and never stored.
can Sealrep give me a mailbox or a domain?
No. Sealrep does not sell, buy or warm mailboxes or domains. You connect mailboxes you already own.
From first email to paid. You approve every step.
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- Nothing sent until you approve
- You send on LinkedIn, X and Reddit
- Unused credits carry over
Lab only · stands in for the hero and the sections after it; the pill appears once the hero buttons have gone
Get paying clients, not just leads.
Sealrep finds your buyers, drafts your cold email, LinkedIn, X and Reddit outreach, sorts every reply, and offers your booking link.
We review every requestFree trial, no card
- Cold emailResearched emails from your own mailbox, after you approve.
- LinkedInNotes and comments drafted for you to send.
- XReplies and DMs drafted for you to send.
- RedditFinds the threads your buyers are in. You post; it drafts.
- AI searchTracks how AI engines answer about you.
- Reply agentReads every reply, sorts it, and drafts the answer.
- Lead dataNamed companies with the reason they fit.
- Your mailboxesDomain checked, ramped slowly, paused on bounces.
- Browser extensionReads the page when you click, drafts what to say.