Alternate address being overwritten

Hi guys, I have an issue with alternate address display.here is the thing…

the domain is @gc.com

I have a MTA that receives emails from @litemail.gc.com. If a user want to sent an email using an alternate address from @gc.com the email arrived with the primary address.

Ej.

Giovanni Guevara:

email: guevarac@gc.com

alternate: gio@gc.com

alternate: giovanni@gc.com

if someone from @litemail.gc.com sent an email to gio@gc.com or giovanni@gc.com the email arrives with guevarac@gc.com as the Display name

so if the end user has a rule to filter the emails he is not able to identify with which address was sent.

If the email comes from outside, Sendmail doesn’t replace any address, it arrives as gio@gc.com

Due to a special request emails from @litemail.gc.com have a direct connection to @gc.com so It makes me believe that the NAB of the Domino Server that receives the email overwrittes the display address so the email lost that address.

I appreciate any suggestion you can give me.

Thanks.