Date: Thu, 15 Jan 1998 07:21:05 -0800 (PST) From: "Jonathan M. Bresler" <jmb> To: font@Mcs.Net (Font) Cc: questions@FreeBSD.ORG Subject: Re: MAIL FROM: address check commented out in /etc/mail additions? Message-ID: <199801151521.HAA00580@hub.freebsd.org> In-Reply-To: <Pine.BSF.3.95.980115000327.11673A-100000@Jupiter.Mcs.Net> from Font at "Jan 15, 98 00:10:01 am"
next in thread | previous in thread | raw e-mail | index | archive | help
Font wrote: > Playing around with some antispam/antirelay mechanisms on my new mail > server, I added in the rulesets from /etc/mail/sendmail.cf.additions as > well as the check_rcpt from http://www.sendmail.org/antispam.html, but > found that non-resolving MAIL FROM: domains weren't being rejected. Upon > closer examination I found that a line in sendmail.cf.additions had been > commented out: > > # R<?> $* < @ $+ > $#error $: "451 Domain does not resolve" > > I was just curious as to whether this was intentional (what are the > disadvantages here? can some legit mail be rejected?) or just overlooked. > I also noticed that these rules were slightly different from the ones on > the sendmail site, but I don't know enough about rulesets yet to be able > to question anything. :-) intentional....there are a lot of broken DNS configurations out there. having the comment in place lets the user decide whether or not to talk to broken DNS configurations. i would rather not make that decision for everyone. rather give them the tool and let them use it, just like you did ;) jmb
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?199801151521.HAA00580>