You send a campaign from [email protected] to [email protected] and it never arrives? The cause is almost always technical: self-send flagged as suspicious.
Important: Microsoft / Google often reject emails that appear to come from their own domain without full authentication.
Why it happens
| Cause | Effect |
|---|---|
| Strict DMARC (p=reject) | Immediate rejection |
| SPF not aligned | Spam filter or reject |
| Missing DKIM | Lower sender score |
| Self-send detected | Suspected spoofing |
Fix in 4 steps
- Configure SPF correctly to authorise Mailpro
- Add a DKIM record
- Check your DMARC policy (start with
p=quarantine) - Test with an external recipient (Gmail, Yahoo) before internal
Special case: Microsoft 365
M365 enforces a very strict policy on internal emails. Fix:
- Add Mailpro's IP to your inbound connector
- Whitelist the domain
spf.mailpro.com - Ask your IT admin to allow Mailpro as a trusted sender
Authenticate your domain in a few clicks. Start free with Mailpro — DNS setup is guided.