Does anyone know what might be causing the following situation?
Crontab emails are bouncing with the message "Message rejected as spam by Content Filtering." (I've contacted the mail server admin about this.)
But emails sent with the command "mail firstname.lastname@example.org" etc. are "stat=Sent ... Queued mail for delivery" (according to the log), but never arrive and never bounce. I've tried sending as root and as other users.
Any help would be greatly appreciated! Thanks.