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Custom SMTP integration

Warm up any mailbox over SMTP.

If your provider speaks SMTP and IMAP, MailStrike can warm it. Add your server details once and the mailbox warms like any other.

Book a Call →How warming works
mailstrike.ai / connect

Step 1 of 5

Connect a mailbox

Google WorkspaceOAuth, 1-click
Microsoft 365OAuth, 1-click
Custom SMTP / IMAPAny provider
How to connect

Connected in three steps.

Yahoo, Proton, Zoho, Fastmail, AWS SES, or your own server. If it speaks SMTP and IMAP, it works.

01

Add your SMTP details

Enter your SMTP server, port, and credentials. An app password works great. MailStrike tests the connection, then uses IMAP to manage warming traffic in a dedicated folder.

  • Works with any SMTP / IMAP provider
  • App passwords fully supported
  • Connection tested before warming starts
mailstrike.ai / connect

SMTP / IMAP details

Connection OKConnect
02

We check your authentication

MailStrike automatically reads your SPF, DKIM, DMARC, and MX records and flags anything that would hurt deliverability before a single email goes out.

  • SPF, DKIM, DMARC, and MX verified
  • Plain-English fixes for any gaps
mailstrike.ai / setup

Authentication check

All passing
SPFv=spf1 include:_spf… ~allPassed
DKIMselector._domainkey · 2048-bitPassed
DMARCp=quarantine · rua setPassed
MXRouted correctlyPassed
03

Warming starts automatically

Personas begin engaging your mail like real recipients. The dashboard tracks every open, reply, and spam rescue live, and tells you the moment the domain is ready for outreach.

mailstrike.ai / dashboard
MailStrike dashboard showing the inbox reputation score, ready-for-outreach status, and a live activity feed of opens, replies, and spam rescues

Hidden by default

Keep warming out of your inbox

Choose Inbox visibility when you connect, and change it anytime in Settings. On Hidden (the default), every warming email is auto-labeled and archived the instant it arrives, so your real inbox stays exactly as it was.

Inbox visibility

Hidden moves warming mail to a label/folder so it doesn't clutter your real inbox.

Hidden

Recommended, clean inbox

Visible

Show warming mail in your inbox

Every thread the personas exchange is written fresh and grounded in your business, never templated. See how warming works.

Get started

Warm any mailbox, land in the inbox.

Connect over SMTP and be outreach-ready in three weeks.

Book a Call →