>> At 05:25 31-01-10, Wael Shaheen wrote: >>> As a solution the routing team was thinking to block port 25 for >>> outgoing as some ISPs do. However, I do not see this to be a valid >>> solution for many reasons such as clients that have email servers >>> outside, or if decided to be redirected to spam filters then that will >>> just cost the company too much.
> On 1/31/2010 4:18 PM, SM wrote: >> Mail submission is done over port 587 and not port 25. On 01.02.10 13:29, Kevin Darcy wrote: > MTA-to-MTA traffic uses port 25. > Also, older MUAs will still often use port 25 even for message > submission, and so will spammers, if they think it will help them bypass > anti-spam protections built into the MSA. those are exactly the reasons why some ISPs block port 25 access. however this is really off-topic here. and I think DNS is really bad place to solve this problem, as it is for failover switching and helping http clients to find out correct site in case of mistake. -- Matus UHLAR - fantomas, uh...@fantomas.sk ; http://www.fantomas.sk/ Warning: I wish NOT to receive e-mail advertising to this address. Varovanie: na tuto adresu chcem NEDOSTAVAT akukolvek reklamnu postu. A day without sunshine is like, night. _______________________________________________ bind-users mailing list bind-users@lists.isc.org https://lists.isc.org/mailman/listinfo/bind-users