My WHM server seems to be storing all its email in the queue manager, I get the following errors from EXIM
LOG: MAIN cwd=/usr/local/cpanel/whostmgr/docroot 4 args: /usr/sbin/exim -v -M 1ZHBnT-0003rU-0v delivering 1ZHBnT-0003rU-0v LOG: MAIN SMTP connection identification H=localhost A=::1 P=60184 M=1ZHBnT-0003rU-0v U=root ID=0 S=root B=authenticated_local_user Connecting to gmail-smtp-in.l.google.com [74.125.70.27]:25 ... failed: Connection timed out (timeout=5m) LOG: MAIN H=gmail-smtp-in.l.google.com [74.125.70.27] Connection timed out Connecting to alt1.gmail-smtp-in.l.google.com [173.194.204.27]:25 ... failed: Connection timed out (timeout=5m) LOG: MAIN H=alt1.gmail-smtp-in.l.google.com [173.194.204.27] Connection timed out Connecting to alt2.gmail-smtp-in.l.google.com [74.125.141.27]:25 ... failed: Connection timed out (timeout=5m) LOG: MAIN H=alt2.gmail-smtp-in.l.google.com [74.125.141.27] Connection timed out Connecting to alt3.gmail-smtp-in.l.google.com [64.233.190.27]:25 ... failed: Connection timed out (timeout=5m) LOG: MAIN H=alt3.gmail-smtp-in.l.google.com [64.233.190.27] Connection timed out
Port 25 is open.