Sendmail Sender Verification

[Ugo Bellavance]

>-----Message d'origine-----
>De : Mike Kercher [mailto:mike at CAMAROSS.NET]
>Envoyé : 30 mars, 2004 01:28
>À : MAILSCANNER at JISCMAIL.AC.UK
>Objet : OT: Sendmail Sender Verification
>
>
>I've been noticing more and more log entries from aol.com 
>lately similar to
>the following:
>
>Mar 29 22:18:24 avwall sendmail[29603]: i2U4INJU029603: 
>from=<>, size=3001,
>class=0, nrcpts=1, msgid=<200403300421.XAG19946 at rly-xk01.mx.aol.com>,
>proto=ESMTP, daemon=MTA, relay=omr-m11.mx.aol.com [64.12.138.23]
>Mar 29 22:18:30 avwall sendmail[29620]: i2U4INJU029603:
>to=<username at somedomain.com>, delay=00:00:07, xdelay=00:00:00, 
>mailer=local,
>pri=123001, dsn=2.0.0, stat=Sent
>
>I assume that the omr- stands for Open Mail Relay or something 
>of the sort
>and I also assume that it is verifying that the email address 
>is deliverable
>prior to delivering an email from an address to the final AOL 
>recipient.  I
>suspect they are doing something like this to combat their massive spam
>flow.

http://postmaster.aol.com/info/servers.html

OMR : outbound mail relay.

Are you an aol subscriber?

Was that an inbound or outbound message?

>
>Has anyone implemented anything like this with sendmail.  I 
>know it would
>introduce additional network traffic, but might it be worth 
>the trade-off?
>Thoughts?
>
>Mike
>