l i n u x - u s e r s - g r o u p - o f - d a v i s
L U G O D
 
Next Meeting:
October 7: Social gathering
Next Installfest:
TBD
Latest News:
Aug. 18: Discounts to "Velocity" in NY; come to tonight's "Photography" talk
Page last updated:
2004 Jun 22 13:13

The following is an archive of a post made to our 'vox-tech mailing list' by one of its subscribers.

Report this post as spam:

(Enter your email address)
Re: [vox-tech] Anyone running a mail server on a dynamic IP?
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [vox-tech] Anyone running a mail server on a dynamic IP?



Quoting Rod Roark (rod@sunsetsystems.com):

> Postfix's built-in spam controls (such as RBL checks)
> operate like this.  In the past, for 3rd party filters like
> SpamAssassin you had to accept the mail first; but if you
> use the above-mentioned "before queue" interface, you can
> presumably invoke stuff like SpamAssassin and ClamAV while
> the SMTP connection is still active.
 
Postfix's policy-daemon interface is quite useful, which is how one is
able to do SPF checks at SMTP time, for example.

What one misses is Exim4's advanced callout functions, which one can use
to conduct automated test checks during the SMTP session, e.g., to
ensure that claimed sender's domain accepts mail to the required
postmaster@ and abuse@ addresses, that it accepts mail as required from
sender "<>", and that the alleged sender's e-mail address is deliverable
-- all prior to (programmatically) deciding whether to accept the mail
under delivery or not.

Thus, your system can conduct those (in my experience _highly_ useful) 
checks and issue a meaningful Delivery Status Notification (SMTP error
code and text message), accordingly.  Something like:

550  Delivery refused, because the alleged sender domain lacks a postmaster 
550  address as required by RFC2821.

-- 
Cheers,           find / -user your -name base -print | xargs chown us:us
Rick Moen
rick@linuxmafia.com
_______________________________________________
vox-tech mailing list
vox-tech@lists.lugod.org
http://lists.lugod.org/mailman/listinfo/vox-tech



LinkedIn
LUGOD Group on LinkedIn
Sign up for LUGOD event announcements
Your email address:
facebook
LUGOD Group on Facebook
'Like' LUGOD on Facebook:

Hosting provided by:
Sunset Systems
Sunset Systems offers preconfigured Linux systems, remote system administration and custom software development.

LUGOD: Linux Users' Group of Davis
PO Box 2082, Davis, CA 95617
Contact Us

LUGOD is a 501(c)7 non-profit organization
based in Davis, California
and serving the Sacramento area.
"Linux" is a trademark of Linus Torvalds.

Sponsored in part by:
O'Reilly and Associates
For numerous book donations.