==== Required information ====
- iRedMail version:0.8.7
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): mysql
- Linux/BSD distribution name and version: Centos 6 64bit
- Related log if you're reporting an issue:
====

I have 3 domains, and an account setup on each:  me@domain1.com, me@domain2.com, and me@domain3.com.  I have forwarding setup in the database for me@domain1.com and me@domain2.com to both go to me@domain3.com.  On domain3.com roundcube i have identities setup to act at me on domain1.com and domain2.com -- Works great.

However, here's the problem:  on my iphone and mac (using Mac Mail.app) I setup the imap connection, and added the addresses of domain1 and domain2 for that account.  If I send as domain3 no problems... but if i try to send as the others I have a relay issue:

"The recipient "***@**.**" was rejected by the server because it does not allow relaying."

I get this even though I use authenticated smtp.... Thoughts?