I have a domain name tinymaze.com. I also have a fake domain tinymaze2.com for my LAN. On my LAN I have a sendmail server. I forward all port 25 traffic heading to tinymaze.com to my sendmail server. Incoming mail works fine. My problem is that mail.tinymaze2.com (the sendmail server on my LAN) tells mail servers that it's <whatever>.tinymaze2.com instead of tinymaze.com.

I need to know how to get sendmail to authenticate as tinymaze.com instead of thinker.tinymaze2.com. The reason is, some mail servers will try doing a lookup on thinker.tinymaze2.com and reject it since it's a bogus domain.

Thanks in advance for any help!

The feauture you use for this is 'masquerading'


in your sendmail.mc you add these entries and make a new sendmail.cf
file probably (m4 < sendmail.mc > /etc/mail/sendmail.cf )
FEATURE(`masquerade_envelope') dnl
FEATURE(`genericstable',`hash -o /etc/mail/genericstable.db')dnl
GENERICS_DOMAIN_FILE(`/etc/mail/generics-domains')dnl

then you need 2 files
/etc/mail/generic-domains put here 'tinymaze2.com' this
way sendmail knows on what domain to operate


in /etc/mail/genericstable you make a table of this this
username publicname
===============
myUser myUser@tinymaze.com


makemap hash genericstable < genericstable
will give you a genericstable.db that will be used
by sendmail. Maybe there are shorter ways, but here you can
give users even an email address outside your domain.

more info on:
http://www.sendmail.org/m4/masquerading_relaying.html