Email domain remapping in sendmail

Sendmail can be configured to remap email domain (sender email) from one to another such as mapping from mail.com to mail2.com

File is: genericstable

Format is:

@mail.com     %1@mail2.com
 

rebuilt it to the correct db format using this command:

makemap hash genericstable.db < genericstable

You need to add the following 2 lines to the sendmail.mc file:

FEATURE(`genericstable')dnl
GENERICS_DOMAIN_FILE(`/etc/mail/generics-domains')dnl

add the domain to generics-domains, format is:

mail.com

change the sendmail.mc to sendmail.cf using this command:

m4 sendmail.mc > sendmail.cf

Then restart sendmail.

In solaris, use this:

svcadm disable sendmail

svcadm enable sendmail

In Linux, use this

/etc/init.d/sendmail restart

Test email using sendmail command

Test email using sendmail command:

sendmail -vt -F"Sender Name" -f From_Email@mail.com To_Email@mail.com

(to include subject, type Subject: after running the command and the rest will be message. Press Ctrl+D when finish)