Georg Sch?nweger: > Hi, > > i have a postfix server which is only used for sending emails to the > outside, no incoming emails are allowed (no MX record). I recently > opened port 587 in master.cf and now i'm asking myself if it is ok to > close port 25 completely? > AFAIK every mail server should accept incoming mails to > postmaster@myserver, but when i close port 25 this is not the case > anymore, isn't it?
Every domain should have a working postmaster address. That does not mean that every MTA should have port 25 open to the Internet. It is quote normal for larger sites to have different MTAs for inbound and outbound mail streams. > 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
