[TYPO3] Where to set from email address for mails sent by typo3?

[Werner Weissenfels]

Partial solution:
I found that I needed to modify the main.cf file for the postfix program 
that sends the mail to correct the origin domain used.

Now I can send emails from the sr_feuser_registration.

I can also send plain text test mails from the install tool.

When I send a html test mail from the install tool, typo3 creates a bad 
from-address, using null at subdomain.domain.org:16080, which still causes 
a bounce when sending it.

Werner