On May 16, Christian Boltz
I'm not sure if I really want SPF...
I like to use one SMTP server for all my mail adresses - most are @cboltz.de (which is the server I use for sending mails), but I also have adresses @web.de and @nexgo.de. GMX already classifies my mails with From: ...@web.de as spam because I don't use the web.de SMTP server. Hey, cboltz.de is definitively not an open relay and has a static IP, so where's the problem?
You send mail from an IP that clearly does not belong to the owner of that domain. This is the major problem with email: Everyone can send from everywhere with every address. SPF is an attempt to solve that. In your case, you could use a transport table entry in your mail server and send all gmx mails to gmx and still use your server as central mail sending hub.
[greylisting]
The idea is quite simple: you temporarily reject *all* e-mail from every SMTP client you haven't spoken to in a while [...]
Greylisting sounds good, at least for blocking viruses. (Don't ask me if it really helps blocking spam, but I don't think so :-(
Greylisting has helped me a LOT, except for nigeria connection type spam, because they (ab)use public webmail services. Markus -- __________________ /"\ Markus Gaugusch \ / ASCII Ribbon Campaign markus(at)gaugusch.at X Against HTML Mail / \