Quoting Hans de Haan (hans.dehaan@solcon.nl): > In order to reduce spam some ISPs are in the proces of closing port 25, > which prevents sending email to an email-server which is other than the ISPs > own. > ISPs have warned the market for this action since august 2003. For sure, when you close port 25, you don't receive spam...:-) ISP's port 25 is not closed, it just refuses to relay mail originating from places different than the ISP clients. *That* is a good anti-spam measure. And it started way before 8/2003, at least here.... Please read again my mail. It never mentions that I was refused to relay mail. Rootsweb refused the mail because it assert that "I should use my ISP SMTP server". I guess they do a DNS reverted lookup on my server IP address and check the domain name of my SMTP server. This is insane. There are lots of cases where people do not have revert DNS resolution working when sending out mail. Or using their own SMTP server. For instance, 3/4 of mail servers in Africa do not have complete operational DNS resolution due to the poor quality and relialability of the infrastructure there. Should they be prevented to send mail? *I use my own mail server*. On my system. This mail server relays all mail I send from the various mail addresses I use daily, including my mail in the Debian Project. Rootsweb is the one and only SMTP server which has ever bounced my mail back with a 550 error and such insane message. So, no, the problem is not on my side, it is on Rootsweb side. Definitely. I had again a mail bounced yesterday because I used this path. This mail I'm currently writing won't be bounced because I will send it through my work SMTP server... Again, the cft-win list is the one and only list where such problem happen. No problem on any other list, including all Debian Project lists (where the SMTP servers administrators are anything but clueless system administrators).