I have setup mailman on a suse box using sendmail behind a linksys router. I have a domain and mx record setup at register.com. The functionality is working; however, the mail sent through mailman/sendmail/linksys router is getting sent to my junk folder at my yahoo.com account, the mail does not make it to my msn.com account, and everything works fine with my various gmail.com accounts, meaning the mail doesn't get sent to my spam folder for may gmail.com accounts. It goes to my inbox. One thought is that yahoo and msn are somehow identifying where the mail is sent from asside from the domain name. The from address used my mailman is the correct domain. For example, the confirmation notice below is sent from mailman. Notice the reference to the 192.168.1.1 IP which is my linksys router. Any insight is greatly appreciated.
Mailing list subscription confirmation notice for mailing list
We have received a request from 192.168.1.1 for subscription of your
email address, "firstname.lastname@example.org", to the email@example.com
mailing list. To confirm that you want to be added to this mailing
list, simply reply to this message, keeping the Subject: header
intact. Or visit this web page: