All of the following must be true:
- Mail autodiscover is enabled
- SSL certificate is installed for the mail domain
- DNS SRV records exist (if DNS is not managed in Plesk)
Required SRV records:
| Type | Service | Protocol | Port |
|---|---|---|---|
| SRV | _smtps | tcp | 465 |
| SRV | _imaps | tcp | 993 |
| SRV | _pop3s | tcp | 995 |
If any of these are missing, auto-configuration may fail.