[MM3-users] Where to configure 'hostname' used in 'From:'-header?

Hello,

I've recently installed MM3 with Exim4  on, say, subdomain.myhost.tld and configured MM3 to use lists.someotherdomain.tld as web host and mail host. Thus, the mailman.cfg contains:

[mta] smtp_host: lists.someotherdomain.tld

When I send a message to test@lists.someotherdomain.tld it gets delivered, however the 'From:'-header becomes "test@subdomain.myhost.tld".