Rodrigo Mufalani wrote: > I want configure postfix autoreply, for undelivery mails > > If one user does not exists.
The short advice: do not. In the case you mention, user does not exist, your postfix should give a 5XX error back to the sending system. That system will then take care of error response to the sender. Secondly, by sending error messages whether to the one in the "MAIL FROM" envelope field or (possibly worse) to the one in any of the "reply-to", "from" or "return-path" mail header fields you will get problems with spam which often forge these fields: 1) In case the recipient of the error message exist, it is likely not the one who should have your error message. 2) In the case the recipient does not exist, this causes a double- bounce, the error message cannot be delivered and is returned to the postmaster mailbox - which is you. A correctly configured server should only generate error messages to local users when a local user's mail-delivery fails. This is already done by postfix when a delivery attempt results in an 5XX error code. Cheers, Erik -- Ph: +34.666334818 web: http://www.locolomo.org X.509 Certificate: http://www.locolomo.org/crt/8D03551FFCE04F0C.crt Key ID: 69:79:B8:2C:E3:8F:E7:BE:5D:C3:C3:B1:74:62:B8:3F:9F:1F:69:B9
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