How lemwarm works: IP reputation, domain reputation, aliases, and SMTP relays
January 30, 2025
|2 min read
Does lemwarm boost my IP reputation?
No. lemwarm improves the reputation of your email address (sender reputation), not your IP address. Over time, this helps your emails reach the inbox instead of being caught by spam filters.
Will lemwarm improve my entire domain reputation?
Not directly. lemwarm improves the reputation of the email addresses connected to that domain, not the domain as a whole.
As long as you follow best practices and keep lemwarm active during and after your campaigns, those email addresses will see improved deliverability.
⚠ Watch out: If other users on the same domain send emails without good practices, it can drag down your overall domain reputation — regardless of lemwarm.
💡 Tip: Use a dedicated domain for outreach to isolate your sender reputation from your main business domain.
Can I improve an alias's deliverability?
No. lemwarm can only improve the deliverability of your primary email address, not aliases.
An alias doesn't have its own inbox — it forwards messages and can't be tracked by the email warmer. Because of this, warming activity can't be attributed to or measured for an alias.
That said, warming your primary email address may have some indirect positive effect on the alias, since they share the same domain.
Can I connect an SMTP relay to lemwarm?
No. lemwarm does not support SMTP relays. It requires a direct connection to a single inbox with both SMTP and IMAP access.
The following providers are not supported:
- SendGrid
- Mailgun
- Sendinblue
- Mailjet
- O2switch
- Amazon SES
- Postmark
- Cloudmark
- Hostgator
If you're using one of these services, you'll need to switch to a supported inbox provider before you can use lemwarm.