Thanks for posting this - I read about in fact breaking the RFC and
blocking anyone that uses an IP for a HELO at junkemailfilter.com and
like it.
I do outgoing email for a client and comcast blocked me because my
reverse was not set-up - migrated servers.. (fixed now)...
So with that big of a customer using strict controls plus
junkemailfilter.com
using IP based HELO blocking, set this in exim.conf and its great -
so far lots of stuff blocked, and if a host is legitimate it ought not be
sending an IP for a HELO nowadays anyhow.
drop
condition = ${if and {{match
{$sender_helo_name}{\N^\[(.+)\]$\N}}{isip4 {$1}}}{true}{false}}
message = Access denied - IP based HELO not allowed. (violates
RFC2821 4.1.3)
This also drops HELO like H=201.130.163.110.dsl.dyn.telnor.net
.. need to fix this for those that use this server for outgoing and run
into this, but I expect not many.
I am new to exim - from postfix camp - love the fact regex can be used -
look forward to learning..
/Gregg
begin:vcard
fn:Gregg Lain
n:Lain;Gregg
email;internet:[email protected]
title:Mochabomb - Web Design + Hosting for Geeks
tel;cell:415-577-5758
url:mochabomb.com
version:2.1
end:vcard
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