On Sat, Aug 8, 2009 at 10:29 AM, Arun Khan<[email protected]> wrote: > > When you are working with ISPs who block *all* outgoing connections on > port 25 but *allow* outgoing SMTP traffic on port 26. There is little > choice that their end user customers have, that is the ISPs network > policy to prevent SPAMMERS from sending out bulk mail to smtp hosts on > the 'Net.
One cannot use MTAs within these networks without a smarthost or a relay outside these networks then. From OP's message, it seemed like he was talking of a MTA. > Most hosting companies thus run their incoming SMTP connections on 26 to > allow MUAs to send outgoing emails. Some ISPs do so on port 587 [1]. These would not be the MX hosts for those domains as they will not be able to receive mails from other MTAs. As good as CUG then. For a CUG, the flexibility for the port to be used always exists with the administrator. -- Mohan Sundaram _______________________________________________ To unsubscribe, email [email protected] with "unsubscribe <password> <address>" in the subject or body of the message. http://www.ae.iitm.ac.in/mailman/listinfo/ilugc
