Problem with Postfix Mail Server 2.7.0
I know very little about Linux.
I have recently started at a school that has a Linux server which manages external mail coming in.
I have a Webmin console that I have login details for and i can see a mail queue of external mail building up. This happened 1 week ago and i rebooted the Linux server and they all delivered. Now it has happened again and the reboot has done nothing.
If i click on the Mail Queue i am informed (lots of times):
host xx.xxx.xx.x said: 452 4.3.1 Insufficient System resources (in reply to MAIL FROM command)
If i click on the System Logs and look in the mail.err log, i have (lots of times):
SVR04 MailScanner[XXXXX]: File checker failed with real error: Insecure dependency in exec while running with -T switch at /usr/share/MailScanner/ /MailScanner/SweepOther.pm line 374
That is my extent of Linux. If anyone could offer any guidance, i would be eternally grateful as i have no external email coming in.
Look forward to hearing from anyone.