Am 23.05.2012 17:55, schrieb Georg Schönweger: > 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?
no - every MX has to accept it internal mail relays usually does not allow any connection from the WAN, but since they do not accept any incoming mail directly this is OK
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