3
Same here.
You can try:
tail -200 /var/log/syslog | grep mail
(or some similar pattern that works out for you) to locate the problematic lines. In my case:
Apr 7 23:20:51 cachogordo postfix/qmgr[2287]: 2D750378714: from=, size=1123, nrcpt=1 (queue active)
Apr 7 23:20:51 cachogordo postfix/error[8296]: 2969B379145: to=, relay=none, delay=0.13, delays=0.06/0.01/0/0.06, dsn=5.0.0, status=bounced (gmail.com)
Apr 7 23:20:51 cachogordo postfix/error[8298]: 2D750378714: to=, relay=none, delay=0.12, delays=0.09/0.01/0/0.02, dsn=5.0.0, status=bounced (gmail.com)
(xxx and yyy conceal the real addresses of course)
So here it seems to be bounced by gmail.com
I set up gmail's server data in the Site Preferences / Mail Setup values:
mail.google.com
"username"
"password"
But still get the same output.
Any idea?