I have little experience with mail and less with postfix. I have several CentOS 7/Oracle Linux 8 servers where I have been forwarding the local mail to user's Exchange email addresses by simply setting up an alias in the /etc/aliases file. root: cy...@umpublishing.org<mailto:cy...@umpublishing.org> oracle: joe...@umpublishing.org<mailto:joe...@umpublishing.org> cyoho: cy...@umpublishing.org<mailto:cy...@umpublishing.org>
We now need to forward oracle's email to an outside account (bob...@dbaconsulting.com). I can make this work by removing the hostname from the sender's address in /etc/postfix/main.cf (setting $myorigin = $mydomain) and setting up a virtual file with the forwarding information. However, when I do this, Exchange won't forward any of the other users email (in the aliases file or using the virtual file). The userids on the linux servers are the same as our userids in Active directory, so It looks to me like the Exchange server does not like the fact that some other server (eg, oraserver.upublishing.org) is trying to forward mail FROM cy...@umpublishing.org<mailto:cy...@umpublishing.org> (normally would be cy...@oraserver.umpublishing.org<mailto:cy...@oraserver.umpublishing.org>) TO cy...@umpublishing.org. Exchange sees itself as being the rightful origin of email from cy...@umpublishing.org<mailto:cy...@umpublishing.org>, but here comes mail with that origin from somewhere else. Can anyone help me with how to set this up? Details: Oracle Linux 8, postfix 2.3.3.1-12.el8_3.1 TIA for any help~ Cindy
