nanog mailing list archives
Re: Mail Submission Protocol
From: Leen Besselink <leen () consolejunkie net>
Date: Wed, 21 Apr 2010 16:16:57 +0200
On Wed, Apr 21, 2010 at 10:05:34AM -0400, Mike Walter wrote:
We have had very good luck with using port 587 and requiring the users to authenticate to send email from outside our network. Inside customers, we have not changed to force port 587 and authentication for email clients, but the topic has come up in discussions. This won't of course, stop spammers if they are hijacking the users local email client settings.
It does however help find the user more easily (if the mailserver logs the username), you can even automate sending an email to them and block them from sending any further email (with exception to support-staff for example).
-Mike -----Original Message----- From: Claudio Lapidus [mailto:clapidus () gmail com] Sent: Wednesday, April 21, 2010 9:49 AM To: nanog () nanog org Subject: Mail Submission Protocol Hello all, At our ISP operation, we are seeing increasing levels of traffic in our outgoing MTA's, presumably due to spammers abusing some of our subscribers' accounts. In fact, we are seeing connections from IPs outside of our network as many as ten times of that from inside IPs. Probably all of our customers are travelling abroad and sending back a lot of postcards, but just in case... ;-) So we are considering ways to further filter this traffic. We are evaluating implementation of MSA through port 587. However, we never did this and would like to know of others more knowledgeable of their experiences. The question is what best practices and stories do you guys have to share in this regard. Also please let me know if you need additional detail. thanks in advance, cl.
Current thread:
- Mail Submission Protocol Claudio Lapidus (Apr 21)
- Re: Mail Submission Protocol Dan White (Apr 21)
- Re: Mail Submission Protocol Daniel Senie (Apr 21)
- RE: Mail Submission Protocol Mike Walter (Apr 21)
- Re: Mail Submission Protocol Leen Besselink (Apr 21)
- RE: Mail Submission Protocol Alex Kamiru (Apr 21)
- Re: Mail Submission Protocol Suresh Ramasubramanian (Apr 21)
- Re: Mail Submission Protocol Franck Martin (Apr 21)
- Re: Mail Submission Protocol Suresh Ramasubramanian (Apr 21)
- Re: Mail Submission Protocol Dave CROCKER (Apr 22)
- Re: Mail Submission Protocol Dan White (Apr 21)
- Re: Mail Submission Protocol Jakob Schlyter (Apr 21)
- Re: Mail Submission Protocol Franck Martin (Apr 21)