Security Basics mailing list archives
Re: Mail Servers blocking BAD Helo
From: Fernando Amatte <famatte () gmail com>
Date: Thu, 30 Dec 2004 18:20:42 -0200
Hello Brandon I faced a similar problem, for a long time I managed ISPs and we decided to use Qmail ( www.qmail.org ) with SPAMCONTROL ( http://www.fehcom.de/qmail/qmail.html ) as our SMTP server. SMPT RFC says that HELO field must be the FQHN, but when you are working with "windows" customers you have a problem ( another one ) . Outlook Express send HELO as the "Machine's name". So we decided do not DNS Lookup for the HELO/EHLO greeting, but use a good and well done blocklist ( badhelo ) with regex. This way we can block some kind of virus, automated Spam programs and thinks like you tell, just including another line on badhelo file. Fernando Amatte
Current thread:
- Mail Servers blocking BAD Helo brandon (Dec 30)
- Re: Mail Servers blocking BAD Helo Anthony J. Cogan (Dec 30)
- Re: Mail Servers blocking BAD Helo Fernando Amatte (Dec 30)
- Re: Mail Servers blocking BAD Helo Steven Moix - Axianet.ch (Dec 30)
- <Possible follow-ups>
- RE: Mail Servers blocking BAD Helo Roger A. Grimes (Dec 31)