Ages ago, I used to know the SMTP protocol by heart but these days I actually telnet into a mail server to diagnose problems so rarely that I forget the details. I could have sworn I had put an article up about this, but can't find it, so here goes. Telnet 25 localhost HELO test.com MAIL From: test@ ... Read Full Article

I keep forgetting to put this somewhere where I will find it again. If you have alot of customers that user AOL.COM and you want to send out announcements it's a good idea to get on their whitelist. [http://postmaster.aol.com/whitelist/ ][1] Here's some more information I found through google: Read Full Article

A tactic that may reduce spam load at least for a period of time until spam virus writers have a chance to update their code. Originally posted on slashdot. ... Read Full Article

I've been doing some searches on VERP, Variable Envelope Return Paths, and Sendmail and so far this is what I've found ... posting them here for posterity: [http://www.velocit ... Read Full Article

We found out the hard way with a recent Personal Stock Streamer announcement to our customers that Yahoo has changed the rules for sending them email. More information can be found on this page: One possible solution for handling bounce messages i ... Read Full Article

An excellent [tool][1] for dealing with queue clogging, examining queue content, troubleshooting, etc.. Highly recommended. [1]: http://jeremy.kister.net/code/qmqtool/ ... Read Full Article

Having not done any sendmail hacking in some years, I was puzzled to find that forwards via .forward files to programs no longer work. I figured it was some new security thing. It turns out that in order for a forward to a program to be accepted you must symlink the executable in question to the /etc/smrsh directo ... Read Full Article