Underscore in sender address

[Andrew Morgan]

On Wed, 22 Oct 2003 pascal at symsol.com.au wrote:

> I noticed that if a underscore is in the domain part
> of the sender address then the email gets bounced
> and trails with a Bad protocol error in my log file..
>
> This is the relevant line out of the mail-log:
>
> Oct 22 11:00:24 sgroup postfix/pipe[27765]: 19AE520E6D:
> to=<root at host.com>, relay=cyrus, delay=0, status=deferred (SOFT BOUNCE -
> data format error. Command output: root: Bad protocol )
>
> and this one is the queue message:
>
> -Queue ID- --Size-- ----Arrival Time---- -Sender/Recipient-------
> 19AE520E6D      575 Wed Oct 22 11:00:24  josef at host_name.gaga.com
>                       (data format error. Command output: root: Bad
> protocol )
>                                          root at host.com
>
> -- 0 Kbytes in 1 Request.
>
> I reproduced that behaviour on several of our servers.
> The only reason why I am concerned is that people send us messages
> from weird (un)masqueraded domains. I could say thats not really my problem
> but if it's solveable then.. happy days.
>
> Does anyone know how to fix that. Maybe I need some escaping or
> it could be a postfix problem.. anything.

Postfix and/or Cyrus is correctly following the RFC for DNS names, which
states that domain names may only contain letters, numbers, and hyphen
(a-z, A-Z, 0-9, -).

Have a look at RFC 1035, section 2.3.1 (http://rfc1035.x42.com).

	Andy