Postfix is not sending mails out

[Digi4care]

I installed openlitespeed.
Loading LiteSpeed/1.6.6 Open
module versions:
modgzip 1.1
cache 1.62
modinspector 1.1
uploadprogress LSIAPI_VERSION_STRING
mod_security 1.2
(built: Wed Jan 22 22:14:41 UTC 2020) ...

and i see that postfix is not sending mail out due it can not connect to the outside it seems?

log:
connect to mail.xxxxx.nl[111.111.111.111]:25: Connection timed out)

i anonymized the domain name and ip

weird part is i can ping to this domain and/or ip

i installed another GKE image and there i have the same problem

 

[Cold-Egg]

If you are talking about google compute engine, port 25 is blocked by Google Cloud.
So no matter you install it manually or from marketplace image, you need to find a way to serve mail in other port.
More info: https://cloud.google.com/compute/docs/tutorials/sending-mail/