<That's not a problem. No decent mailserver or anti-spam program will complain if the EHLO/HELO does not match the PTR.>
But some are starting to do just that (supanet.com). what if this practice become more widely used ?
Then don't send mail to them. The RFCs say they can't block your mail even if your EHLO/HELO is invalid. But yours is 100% valid!
The problem is on their end. If supanet.com is doing this, it is their problem.
Shouldn't IPSWITCH add an option to let us define what ehlo should be used with VD?
It would be nice if they did. But it won't solve the problem -- tomorrow, it will be something else. Supanet's competitor will say "Reverse DNS entries must have the word MAIL in them". Then Supanet will say "Too much spam is coming from EHLO/HELO's that have 'mail' in them -- we're going to reject such mail." Now you can't send E-mail to both Supanet and their competitor.
When someone chooses to require something silly in order to send them E-mail, you have to make a judgement call. Are you willing to switch mailservers because of some bozo that doesn't understand how mail works? What happens when you switch mailservers, but then there is a new requirement that the new mailserver won't handle?
This is the problem with trying to make new rules for an old game. For the same reason that we can't easily come out with "SMTP2" that has controls to minimize spam, people can't start making new assumptions unless there are very good reasons behind them, and the requirements are within reason. Requiring the EHLO/HELO to match the PTR is plain silly. It may work well in a weighted system (making it more likely that the E-mail will be marked as spam), but not for outright rejections.
Somewhere you have to draw the line as to what hoops you will be willing to jump through to get other people to read your mail.
-Scott
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