[Mailman-Users] SMTP All recipients refused: host not found (question)

I am running RH 7.1 , Sendmail , and Mailman 2.0.5 Basically I recieve this message in SMTP under /home/mailman/logs/smpt and a number of ignores in smtp-failure The strange part is that the list works fine from 3:00 am (or so (inconsistant)) untill 7:00pm or so.. it's only in the times between 7

[Mailman-Users] SMTP All recipients refused: host not found (question)

I am running RH 7.1 , Sendmail , and Mailman 2.0.5 Basically I recieve this message in SMTP under /home/mailman/logs/smpt and a number of ignores in smtp-failure The strange part is that the list works fine from 3:00 am (or so (inconsistant)) untill 7:00pm or so.. it's only in the times