using the character @ in the local part
I tried using an e-mail address "@"@... in postfix. When I try
to deliver a mail to it, postfix rejects it with the error message
501 5.1.3 Bad recipient address syntax (state 13)
I defined an alias, so in theory it should work. The recipient address
is totally valid as far as I know and as far as online validators tell.
Thanks for any hints.
- 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.