Upgrade and email fails

[mojave]

We host on 3rd party cloud and the system upgraded to the latest version of 20 yesterday and now suddenly emails (voicemail, password reset, etc) are failing. Nothing changed on our SMTP and firewall. I try and use the test email function and I get this "Ensure that port 587 TCP is open for outbound traffic" but no further details in event log etc.

Any help our thoughts would be appreciated.

 

[SteveITS]

It’s a custom SMTP server? Is DNS working on the 3CX server?

 

[mojave]

It is Google SMTP. I don't see any DNS settings in 3cx nor have we ever adjusted them. Looked in Settings > Network

 

[Fabian Jsn]

We host on 3rd party cloud and the system upgraded to the latest version of 20 yesterday and now suddenly emails (voicemail, password reset, etc) are failing. Nothing changed on our SMTP and firewall. I try and use the test email function and I get this "Ensure that port 587 TCP is open for outbound traffic" but no further details in event log etc.

Any help our thoughts would be appreciated.

Make sure did'n firewall block this one

• SMTP Service: Cloud Service for SMTP Messages
  smtp-proxy.3cx.net, 2528 (outbound, TCP)

 

[mojave]

Thanks for the note. That is not blocked on our network firewall. Unless there is a 3CX application firewall which I haven't found yet.

 

[SteveITS]

I don't see any DNS settings in 3cx nor have we ever adjusted them. Looked in Settings > Network

DNS would be in /etc/resolv.conf on Debian. "dig 3cx.com" should return that domain's IPs.

 

[Alphabetic]

Are you able to run

telnet smtp.gmail.com 587

 

[mojave]

telnet is not installed so it won't run.

 

[Fabian Jsn]

it's weird if no firewall block the connection (makesure your firewall on os level not running like nftables), and mybe you can try to update the 3CX to lates ver, or mybe you need to use custom smtp.

 

[mojave]

Yeah agreed. This was working fine before the latest v20 upgrade and nothing else has changed as far as I can tell.

 

[luckystrikes]

We are seeing all PBX's with gmail SMTP fail today. It was totally random... go to 5.7.8
v20 and v18. V20 had to switch to new Gmail intergration and works fine.