Re: using the character @ in the local part
- On Thu, Jan 03, 2013 at 04:02:41AM +0100, Michael Blessenohl wrote:
> I tried using an e-mail address "@"@... in postfix. WhenThat's not a Postfix rejection message. Show logs & postconf -n.
> I try to deliver a mail to it, postfix rejects it with the error
> 501 5.1.3 Bad recipient address syntax (state 13)
> I defined an alias, so in theory it should work. The recipientIt is valid. It is not sane, but indeed, with proper quoting as
> address is totally valid as far as I know and as far as online
> validators tell.
shown, it should work.
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- Michael Blessenohl:
> The security issue is, as far as I understand, that a backup MX uses anCome on, don't be so naive. The backup MX scenario is an EXAMPLE
> @ in the local part for internal purposes. Which, in theory, can be
> exploited to use the server as open relay. As long as I don't use a
> backup MX, I don't have an open relay and everything is fine, isn't it?
of how @ in local-part can result in trouble. The same problem may
happen in ANY piece of software that decisions based on the content
of an email address.