MSA stands for "Message Submission Agent" (MSA), runs on port 587 and is documented in RFC 2476. Port 25 is used for the "Message Transfer Agent" (MTA). Basically you need to run both for a fully compliant modern mail system.
The Abstract of http://www.faqs.org/rfcs/rfc2476.html has a good explaination on the reasons behind MSAs. However one area that the RFC politely avoids is the masses of bugs in MUAs (mail clients) that result in non-compliant messages being passed to MTAs :-) You should also configure your mail clients to use port 587 for SMTP sending instead of the default 25. Cheers. > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] > Sent: Monday, April 19, 2004 4:09 PM > To: [EMAIL PROTECTED] > Subject: [courier-users] What is the difference between ESMTP and > ESMTP-MSA? > > > Can anyone explain or provide a link to information on the > differences between ESMTP and ESMTP-MSA? I understand that > ESMTP-MSA is considered more secure, but why? Should esmtpd > be run in parallel to esmtpd-msa or is it better to run only > esmtpd-msa? > > Thanks, > -Mike Warning: Copyright ResMed. Where the contents of this email and/or attachment includes materials prepared by ResMed, the use of those materials is subject exclusively to the conditions of engagement between ResMed and the intended recipient. This communication is confidential and may contain legally privileged information. By the use of email over the Internet or other communication systems, ResMed is not waiving either confidentiality of, or legal privilege in,the content of the email and of any attachments. If the recipient of this message is not the intended addressee, please call ResMed immediately on +61 2 9886 5000 Sydney, Australia. ------------------------------------------------------- This SF.Net email is sponsored by: IBM Linux Tutorials Free Linux tutorial presented by Daniel Robbins, President and CEO of GenToo technologies. Learn everything from fundamentals to system administration.http://ads.osdn.com/?ad_id70&alloc_id638&op=click _______________________________________________ courier-users mailing list [EMAIL PROTECTED] Unsubscribe: https://lists.sourceforge.net/lists/listinfo/courier-users
