On Wed, 2004-10-27 at 08:16, Ow Mun Heng wrote: > May I ask, what do you use the MSA for? I believe it's only for a > _local_ mail submission. You're confusing it with the MSP. MSP: Message Submission Program This is for locally-submitted mail on your server. sendmail runs using the submit.cf configuration file, queues messages in /var/spool/clientmqueue and attempts to deliver the mail on to the MTA running by default on port 25 of localhost. MSA: Mail Submission Agent: A mail server for submitting mail for delivery from other Internet hosts. Listens on port 587 and will relay mail once the client is authenticated. Intended for "roaming" users so that they can send mail from their regular SMTP server wherever they are (including on ISPs that block outgoing port 25 connections). > But what is the difference then to just point > the submission to port 25 default? Port 25 is the MTA, mainly there for accepting delivery of incoming mail (but also for relaying out messages originating within the organisation). The MSA is intended exclusively for submission of outgoing messages. > I can understand the usage of MSA is only port 25 is closed and you're > not running as a mail-hub from internet. I use my MSA all the time. I never have to change mail settings, wherever I am. Paul. -- Paul Howarth <paul@xxxxxxxxxxxx>
