Cannot send email

[rhbvkleef]

I'm a bit confused as to why I cannot send email. This is what my log shows:

smtp::outbound::delivery: context="connect" event="failed" mx="alt4.aspmx.l.google.com" reason=I/O error: Connection timed out (os error 110)

Firewall rules allow all outbound, inbound, and forwarding, and I am able to ping `alt4.aspmx.l.google.com, both over IPv4 and IPv6. What are futher debugging steps I could take?

Edit: After enabling trace logging, no extra information is shown. Journalctl doesn't show anything interesting around the time that the email is submitted.

[rhbvkleef]

Turns out Linode is blocking outbound submission. I am now in contact with their support in an attempt to get this problem resolved.

[Walker-00]

Same issue here, but for me the ports are seems to be open when I check my port from my local machine to vps ( where is the mail server is hosted ) with telnet " telnet 25" it return this "220 Stalwart ESMTP at your service", but mail are not sending and error is connection timeout firewall is wide open for all port and all protocols out and in. my server is hosted on oracle.