Re: using the character @ in the local part
- Am 03.01.2013 04:13, schrieb Michael Blessenohl:
> Am 03.01.2013 04:06, schrieb Reindl Harald:have fun changing the world
>> Am 03.01.2013 04:02, schrieb Michael Blessenohl:
>>> 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
>> why are you try using such addresses?
>> it does not matter what some validators or even any RFC says
>> special chars should not be used because ANY relay-hop has
>> to accept used senders and RCPT or your email will not get
>> delivered finally
>> means: even if you can configure YOUR postfix you will
>> not be able to do it for the rest of the world
>> "0-9" and "a-z" are the safe chars
> Well someone has to start implementing the standards correctly or there is no point in making them anyway.
prepare to lose the fight
i will continue to reject any address with more than one @ on
websites because there are only few funny people using special
chars while the rest of the world takes care to use safe ones
- 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.