› VitalPBX Community Support › General Discussion › Postfix › Reply To: RE: Postfix
Check this link:
https://support.plesk.com/hc/en-us/articles/360003640094-Mail-cannot-be-sent-or-delivered-mail-transport-unavailable
This is the first time that someone reports an issue regarding postfix, so, sincerely, I don’t know the cause of this and how to solve it.