Folks - I'm not sure if this is really on topic, but here's my problem. I
currently run my own mail server from home and, of course, I have no
issues with providing anti-spam, anti-relaying, etc. However, my ISP is
probably going to switch me to a port-restricted PPPoE DSL connection. Thus, I'm not going to be able to run mail mail server.
I do have the ability to put my server in a friend's server room but how do I ensure that only "my" computers have the ability use the SMTP Postfix server to send mail? I mean, the server has to be able to receive legitimate SMTP mail, but I don't want anyone else to be able to relay from my server. Since I will have a *very* dynamic (apparently) IP address, I can't use the IP address restrictions within the main.cf to address what IPs can use the server to relay. I thought about SMTP SASL authentication but it seems to me (please correct me if I'm wrong) that this will block legitimate incoming mail to myself - won't it?
Anyway, if anyone has suggestions or point me to the right resouce, it would be greatly appreciated!
SASL is the right way to go. I don't know how to do this in Postfix as I'm a sendmail user myself, but the gist of it is that SASL is used to control who can relay mail; it should have no effect on mail delivery to "local" domains, i.e. your own, which will not require authentication as there is no relaying involved - the mail is to be delivered locally, not relayed elsewhere.
Paul.
