Hi @girish ,
I see, it seems to be that indeed. The server runs on Upcloud actually.
I will try one of the solution you propose.

Many thanks for your help,
d

Hello there,
In the email status of the cloudron email menu, the smtp status failed for "Outbound SMTP" with the following error:

Connect to smtp.gmail.com timed out. Check if port 25 (outbound) is blocked

The port is open in my machine. Further, the email logs give those message :

n 17 05:29:44 [INFO] [A752ADA6-766A-40AB-88E4-E532DEC54767.1.1] [outbound] Attempting to deliver to: 108.177.97.26:25 (0) (8)
Jan 17 05:29:44 [INFO] [-] [core] [outbound] [outbound::25:108.177.97.26:undefined:50] dispense() clients=1 available=0
Jan 17 05:30:14 [NOTICE] [-] [core] [outbound] Failed to get pool entry: Outbound connection timed out to 108.177.97.26:25
Jan 17 05:30:14 [INFO] [A752ADA6-766A-40AB-88E4-E532DEC54767.1.1] [outbound] Looking up A records for: alt4.gmail-smtp-in.l.google.com
Jan 17 05:30:14 [INFO] [-] [core] [outbound] [outbound::25:108.177.97.26:undefined:50] dispense() clients=0 available=0
Jan 17 05:30:14 [INFO] [A752ADA6-766A-40AB-88E4-E532DEC54767.1.1] [outbound] Attempting to deliver to: 173.194.202.26:25 (0) (8)
Jan 17 05:30:14 [INFO] [-] [core] [outbound] [outbound::25:173.194.202.26:undefined:50] dispense() clients=1 available=0
Jan 17 05:30:44 [NOTICE] [-] [core] [outbound] Failed to get pool entry: Outbound connection timed out to 173.194.202.26:25
Jan 17 05:30:44 [INFO] [-] [cloudron] EVENT (A752ADA6-766A-40AB-88E4-E532DEC54767.1.1): Mail from <no-reply@mysite> to <me@mail.com> was deferred because of "Tried all MXs". Will retry in 4096 seconds

I've also follow the guide to setup the DNS record...
Beyond that everithing is working, app are running...

Any idea of what I can try to get the outbound mail working ?

Thanks,
d