Date: Thu, 01 Jul 1999 12:41:44 +0100 From: Jason Thomson <jason.thomson@mintel.co.uk> To: freebsd-isp@freebsd.org Subject: Sendmail 8.9.x check_mail anti-spam rule broken? Message-ID: <377B53F8.34DE5461@mintel.co.uk>
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As I understood the sendmail anti-spam rules, they are supposed to reject
Sender addresses whose domain part does not _resolve_. I was under the
impression that meant the domain had to have either MX or A or CNAME
records.
However, it would appear that the domain must have an A record. Or mail is
rejected with:
reject=451 <>... Sender domain must resolve
For example, some.one@btinternet.com gets rejected. But btinternet.com
has perfectly valid MX records. BT Internet is probably one of the UK's
biggest ISPs.
Can someone confirm that this is the expected behaviour (and I haven't got a
broken config) and that this behaviour is correct (and not a bug).
If by _resolve_, this means that a domain must have an A record, then
maybe I need to add A records for all the domains that I maintain, and
remove this anti-spam rule from my sendmail.cf file. (Because I might want
to be able to receive mail from companies like British Telecom, MCI
Worldcom etc. :-).
However, this it doesn't seem quite right that a domain should require an A
record. (I notice that freebsd.org does have an A record). Also, whilst
our server rejected one legitimate message, that same rule has rejected
several spams already today.
Thanks for any pointers and info.
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