Re: [SLE] Help Regarding qmail-smtpd

Message-Id: <5.0.2.1.0.20001203160344.00a0bc60@sol.ece.usu.edu> Date: Sun, 03 Dec 2000 16:04:00 -0700 From: Irwan Hadi Subject: Re: [SLE] Help Regarding qmail-smtpd At 05:03 AM 12/3/00 -0800, Ashok P wrote:

hi,

i'm running qmail-smtpd, when somebody connects to port 25 and issues the following commands

helo 220 server.com mail from: #i get a response saying 250 ok

this is dangerous as people could assume false identities and send mails. is there any way by which qmail can prevent this from happening like doing a reverse dns lookup or so.

from www.qmail.org/top.html Nagy Balazs wrote a patch to ensure that the domain name on the envelope sender is a valid DNS name (local copy by request of author). This ensures that you do not receive email which you cannot bounce, should that prove necessary. http://www.qmail.org/qmail-1.03-mfcheck.3.patch