I must be thick, but I can't see how to get postfix to simply send an email with a header that ONLY mentions the virtual host as the source host of an email. Presently I am getting a lot of trasmissions flagged as spam because they emanate from "serverhostname" (the actual server), and its IP address, while the from line is carrying the the FQDN and IP address of the virtual domain. I have external dns servers with each virtual domain having its own IP address and the records in each zone file are like: inet A mail.this .dom.tld 188.8.131.52 MX 10 mail.this.dom.tld reverse pointers for each tld My mail header "Received from" shows the mail as being from the ip address of the "serverhostname (101.101`.101.101.static.thedns.com) I would really like "Received from" in the header to show "mail.this.dom.tld 184.108.40.206.static.thedns,.com). Then perhaps I wouldn't get spam rated, or spam bucketed emails. Does this contravene some rfc or another, and if not, or how to do it?