ResolutionIf you configured mail client (for example Outlook) to use Plesk SMTP server and get an error when trying to send mail please choose the case that best matches to your situation:
- I get connection error, 1388.
- I get password error, mail client asks about password again and again, 1391.
- I get the error: 553 sorry, that domain isn't in my list of allowed rcpthosts (#5.7.1), 168.
- The error like "There was an error sending your message: unable to send data", 1522.