Emails from 3CX no longer working

[nhenjes]

Emails are suddenly not working from our 3CX server. They had worked in version 14 and now version 15, but recently I noticed they stopped coming, and I can't send email invites to new users.

The error I'm getting is:

Like I said, none of those settings have changed, and it did work in the past.

 

[craigreilly]

You do not mention the mail server and hosted or on site.
If a hosted solution of any sort - it is possible they changed their requirements for relaying mail.

 

[nhenjes]

Yep, sorry. On premise Exchange 2007 that I'm in charge of. I haven't changed anything.

 

[pact]

Are you certain your Exchange Certificate is still valid?

The error does mention an invalid certificate (as you are attempting to use SSL).

Does it fail on non-ssl relay?