Re: [exim] need to rewrite _ characters in MAIL FROM domain …

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Autor: Todd Lyons
Data:  
Dla: Dave Lugo
CC: exim-users
Temat: Re: [exim] need to rewrite _ characters in MAIL FROM domain part
On Tue, Nov 22, 2011 at 6:35 AM, Dave Lugo <dlugo@???> wrote:
>> I seem to have some apps that are sending with a underscore in
>> the domain part.  Searching the exim-user archives suggests that
>> I can work around this by rewriting the MAIL FROM address,
>> replacing the domain part _ chars with . chars.
> I decided to try to be simple - any MAIL FROM with a domain part
> ending in example.com, that is preceeded by an element containing
> an underscore, gets replaced with example.com.


That's not what your regex has below. Let's analyze it.

> user@???_asd_asd.example.com  --->  user@???
> But trying to go with this:
> \N^(.*)@*_*.example.com(.*)$\N    $1@???$4        SF


Wrapping the regex with \N is good. That means you don't have to do
do all kinds of ugly escaping.

What is messing you up is the @*_*. That literally means "zero or
more @ signs followed by zero or more _ signs". What you meant was
"@.*_.*\.example.com". You were thinking shell style or sendmail
style wildcard instead of regex.

Second, you said "with a domain part ending in example.com". But your
regex searches for "example.com(.*). That means that example.com
could match anywhere in the hostname.

Finally, drop the $4 from the rewrite part.

CentOS56[root@ivwm51 ~]# grep example.com /etc/exim/exim_TEST.conf
\N^(.*)@.*_.*.example.com.*$\N    $1@???        SF
CentOS56[root@ivwm51 ~]# exim -C /etc/exim/exim_TEST.conf -brw
user@???_asd_asd.example.com
    SMTP: user@???


Regards....          Todd
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