Whenever i send out email from my server, they are getting flagged as spam with some online mail services like yahoo and hotmail. I have the reverse dns setup correctly and the headers look fine to me. I also compared the headers to an almost identical email I sent from a shared server I use that doesn't get its email flagged as spam, and they look pretty much identical minus the email addresses. Any ideas what I could be forgetting?

NOTE: I've tried sending mail with squirrel mail thats included in cpanel, php's plain mail() function, phpmailer (http://phpmailer.sourceforge.net/) class and pear's mime mail class and I get the same results. Yahoo and Hotmail emails get throwin in the bulk folder. Gmail doesn't seem to have a problem with them though.


Email gets flagged as spam (http://section31.us/temp/mail/saved/rhinoview_phpmailer.txt)

Email does not get flagged as spam (http://section31.us/temp/mail/saved/section31_phpmailer.txt)

rdns setup
(http://dollardns.net/cgi-bin/dnscrawler/index.pl?name=72.29.84.159&type=PTR&lr=12&submit=Reverse+IP#report)


Server Info: Dedicated Server Running redhat with cpanel as the control panel using Exim as the mail server.

Blacklisted IP?

We also have that problem, only it's not happening with all hotmail addresses. If I mail to my own hotmail address it goes nicely into the "Inbox" however if I send it to a customer of us, it's posted in the "Unwanted items". I think it's just a setting in the spamfilter from gmail / yahoo / hotmail. And no our IP's aren't blacklisted :)

I bet there are users on that server with email forwarders set up which are forwarding everything including spam. Yahoo and the others get the spam and it looks like it's from your server so after so much of it, they automatically put all mail from your server in the bulk/spam folders.

Allowing forwarders to outside mail providers is getting to be a problem.