Office user for POP delivery or forwarding. Office is way faster and consumes fewer system resources than sendmail. However, like sendmail and first-generation Web server programs, Post. Office forks a process for every message sent. Office doesn't really provide an easy way to do this.
Office provides program delivery.
It will pipe mail to the Unix program of your choice. You can probably fairly quickly construct a shell or Perl script that will append a message to a file, but keep in mind that two copies of the Post. Office mail transfer agent could be running at the same time. You need to come up with some locking system to ensure that the archive file isn't corrupted by two simultaneous incoming messages. Anyway, I think the Post.