Am 23.05.2012 19:35, schrieb Georg Schönweger:
> Am 23.05.2012 19:08, schrieb Wietse Venema:
>>> and another question regarding port 25;
>>> when my postfix server generates a bounce message (which happens when
>>> sending a mail to non existend address) and sends it back to the
>>> originally envelope sender, he uses "From: [email protected]"
>>> as sender of the bounce message. Does [email protected] has to
>>
>> It is your responsibility to ensure that Postfix sends such mail
>> with the correct domain name.  See
>> http://www.postfix.org/BASIC_CONFIGURATION_README.html#myorigin
>>
>>      Wietse
>>
> 
> What does "correct domain name" mean? Currently im using "myserver.tld"
> as domain name which has an A-Record pointing to my server (and a
> reverse dns record as well). Do i have to allow incoming mail on this
> domain too? (atleast for MAILER-DAEMON@ and postmaster@)

you have simply to use your PUBLIC, official domain name

if you send with "@myserver.tld" there has to be ANY mailserver
accepting a) this domain and b) this specific sender address

you must not send mails with a non-working sender domain
becasue a) you violate RFCs and b) servers with sender-verification
will never accept such messages

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