I just thought I would share a tip that had me puzzled for a couple of days.
When configuring IMM 2 Firmware 2.50 (1AOO40Z) i was having issues getting emails to send.
I won't go through everything, but the solution was to use a FQDN under the DDNS section. All of the domains i manage use .local extentions, so naturally i put domainname.local.
This needs to be changed to domainname.com.au (or something appropriate).
What IMM seems to do is generate the SMTP From address using the domain name assigned, and obviously firstname.lastname@example.org won't be accepted by any SMTP Server.
Anyway, i hope this helps someone else in the future.
On a side note, it would be much better if IBM just simply gave an option to specify the sending smtp address :)