can not send email - SMTP error on roundcube
#7
RE: can not send email - SMTP error on roundcube
There are a few reason why this could happen. I took a peek on Google (since I am still learning the ins-and-outs of *nix email systems) and it could be improper MX records, email address blocked, spam blocking, etc. [google]The error that the other server returned was: 554 5.7.1: Relay access denied[/google]

Not much help from me Sad
But there are a lot of reasons for it and you will need to read through them and check your settings. The first one (Bob Cares?) seems to have several solutions.
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RE: can not send email - SMTP error on roundcube - by TGates - 08-18-2016, 12:07 AM

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