First off, thanks for reading and replying to the real question, as always.
> And if they were to accept your email, they may very well deliver > your message to the spam folder, because you are sending from an > inappropriate IP address. True, but there are many _other_ reasons why "they" may think that my message belongs in the spam folder. It is also not unheard of that a destination replies "OK" and yet discards or looses the mail. These things happen all the time. If one can't live with that, better not use e-mail at all. Also, IMHO a spam folder is meant for "in doubt" cases, so it is supposed to be inspected regularly. Upon inspection, "they" can see at first sight that my mail is not spam. At the very least, "they" can then release it. They also could (and IMHO should) use it to improve their hit/miss rate. On the other hand, if people choose to use their spam folder as a black hole, they may loose business. My business, or other people's business, I don't care. Their choice, their problem, not mine. That doesn't mean I don't appreciate your heads-up. It only means that the risk is acceptable - to me and my specific situation. But others may have a different situation (volume, mix of mail etc.) and come to a different conclusion. As an aside, I have also read Ralf Hildebrandt's ten-year old analysis of the issues of running a mail server on a dynamic IP, here: https://www.arschkrebs.de/postfix/postfix_why_dyndns_does_not_work.shtml His chapter on "receiving mail" was very helpful for my own thinking through the risks involved, but here too the probability of his "worst case" scenario is sufficiently low - in my case - to consciously accept the risk of loosing some mail in that case. And implementing a test for the presence of a mail server on my old IP (after the change-over) is now on my to-do list <g>. Luc
