In our configuration the final delivery mail server is not listed in the MX records for the various domains that we host. Instead the highest priority MX hosts relay directly to the common final delivery host using transport maps and disabling MX lookups:
example.com relay:[delivery.domain.tld] .example.com relay:[delivery.domain.tld] example2.com relay:[delivery.domain.tld] .example2.com relay:[delivery.domain.tld] The public MX hosts are the same for all of the domains that we host as is the final delivery host. Experimentation seems to indicate that a relays_domain map that contains example.com is redundant in this situation but, given my inexperience with Postfix, I would like to have this inference confirmed or denied by someone who knows for sure. Given the requirement for the transport map on the MX hosts does the relay_domains value need to be set at all? -- *** E-Mail is NOT a SECURE channel *** James B. Byrne mailto:byrn...@harte-lyne.ca Harte & Lyne Limited http://www.harte-lyne.ca 9 Brockley Drive vox: +1 905 561 1241 Hamilton, Ontario fax: +1 905 561 0757 Canada L8E 3C3
