6 messages in net.sourceforge.lists.courier-usersRe: [courier-users] 417 SPF error use...
FromSent OnAttachments
Jerry AmundsonMar 30, 2006 7:40 am 
Bill TaroliMar 30, 2006 11:17 am 
Jerry AmundsonMar 30, 2006 1:11 pm 
Bill TaroliMar 30, 2006 1:51 pm 
Dave PlattMar 30, 2006 2:34 pm 
Sam VarshavchikMar 30, 2006 3:20 pm 
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Subject:Re: [courier-users] 417 SPF error user@cogeco.ca: DNS MX lookup failed.?Actions...
From:Sam Varshavchik (mrs@courier-mta.com)
Date:Mar 30, 2006 3:20:38 pm
List:net.sourceforge.lists.courier-users

Jerry Amundson writes:

SPF string used: v=spf1 ip4:216.221.81.0/24 a:smtp.cogeco.net mx:mx.cogeco.ca
?all.

mx.cogeco.ca does not have an MX record, only an A record.

cogeco.ca's SPF record is broken.

http://www.ietf.org/internet-drafts/draft-schlitt-spf-classic-02.txt

5.4. "mx"

…

Note regarding implicit MXes: If the <target-name> has no MX records, check_host() MUST NOT pretend the target is its single MX, and MUST NOT default to an A lookup on the <target-name> directly.