> would they not then block official port 587 as well as port 25? > That was the position I heard the 'customer service rep' take the last > time I tried to solve such a problem through appeal to bureaucratic > sensibility.
There isn't really a (valid) reason to block port 587: Blocking outgoing connections to port 25 may be done in order to block some zombie-networks (but IMO this is just silly.. will they also block port 80 soon to stop this blog-spamming? .. anyway ..) ..but you cannot spam using port 587 (unless you've been hijacking a valid account): An smtpd running on port 587 must not accept mails from unauthenticated clients for any recipients: Connected to smtpauth.bluewin.ch. 220 tr12.bluewin.ch ESMTP Service (Bluewin 7.3.121) ready helo bla 250 tr12.bluewin.ch mail from:<> 530 authentication required for mail submission ..only MUA/MSAs are supposed to use port 587. Regards, Adrian (Did anyone ever see/know an ISP blocking 587 ?) _______________________________________________ swinog mailing list [email protected] http://lists.swinog.ch/cgi-bin/mailman/listinfo/swinog
