Joel Liu's Library tagged spf →  View Popular

I've run into this same sort of problem, and I've discovered that spoofing the from address is a really, really bad idea; there's a sizable chunk of mailservers that will reverse DNS the IP address they're receiving the email from, and if it doesn't match the domain in the from address, they'll reject it.

Welcome to my world. I work on email deliverability for a financial services company, so no, I'm not a spammer. Hotmail makes two tools available to you to help you get your email delivered:



MSN Smart Network Data Services: http://postmaster.msn.com/snds/ [msn.com]

This will let you put in your SMTP's IP address and it will give you consolidated stats on how much mail was received, and how much was filtered as spam.



Sender Score Certified: http://www.senderscorecertified.com/ [senderscorecertified.com]

This company will "certify" you as a safe sender, and Hotmail will let your emails in unfiltered. The catch is you have to pay for this.



Good luck. It isn't easy, but at least there are some tools at your use.

This is an SPF
implementation for qmail.

SPF is something like a DNS based "reverse MX" system to
designate permitted senders for mails depending on the domain name.
The goal is to disallow sender address forgery.

The patch is entirely written using the qmail string and DNS functions, and thus
completely integrated into qmail without external dependencies.

It can check incoming mails inside the SMTP daemon, add Received-SPF lines
and optionally block undesired transfers. The check is performed at
the envelope level.