sendmail using relay getting blocked on way to internet

[Alexander Dallas]

I am trying to configure sendmail on a MPE/iX platform to email out to the internet using the corporate email relay host. I have been able to get it to only intranet users when I hard set the domain to be different. The corporate internet mail filter sees the domains being different and discards the email when I try to send it to an Internet email account.
I have a HP3000 server running MPE/iX 7.0 and sendmail 8.7 that came with the OS. I hard set the LOCAL DOMAIN NAME(Dj) to hp3000.goose.com and the SMART RELAY HOST(DS) to ERelay.duck.com in the /etc/mail/submit.cf and sendmail.cf. Because the email domains are different I can get the mail to relay to myaccount@duck.com. However the FROM address is something@hp3000.goose.com. Is there a way I can get the from address to be something@duck.com?

[Alexander Dallas]

If I add MASQUERADE_AS(`duck.com') into the submit-mpeix.mc file it then comes out as something@duck.com. Now how to change the sender name from "something" to "myaccount".