sendmail: from virtual address changed to maindomain

[Roberto Nunnari]

Hi all.

This is driving me mad.. I hope a kind soul can help me out..
This is the relevant environment:

# uname -rms
FreeBSD 6.1-RELEASE-p23 i386

# hostname
jupiter.maindomain.com

# cat /etc/mail/local-host-names
maindomain.com
mydomain1.com

# cat /etc/mail/generics-domains
mydomain1.com

# cat /etc/mail/genericstable
md101        john at mydomain1.com
md102        jack at mydomain1.com

# cat /etc/mail/virtusertable
john at mydomain1.com            md101
jack at mydomain1.com            md102

entries in hostname.mc
FEATURE(virtusertable, `hash -o /etc/mail/virtusertable')
FEATURE(genericstable, `hash -o /etc/mail/genericstable')
GENERICS_DOMAIN_FILE(`/etc/mail/generics-domains')

MX hostnames are all A records.

well, as long as the users receive/send emails from/to external domains
everything works just fine, but when:

john at mydomain1.com sends to jack at mydomain1.com or viceversa

the message gets to the right user, but the from header is
changed to john at maindomain.com, mailbox that doesn't exists!

Any hints/suggestions?

Please, help!

Thank you.
Robi