sendmail domain hosting

[Liivo <liivo nnm ee>]

Hello,

I've two domains, for example aaa.ee and bbb.ee. My linux-box is
server.aaa.ee and everything is working properly (mails from and to
liivo aaa ee). My ISP added to DNS that bbb.ee is a nickname for
server.aaa.ee. Now when I send mail from/to liivo bbb ee, sendmail messes
the address up, so it is liivo server aaa ee  What could I do to prevent
that remapping? I need that liivo bbb ee is still liivo bbb ee and
liivo aaa ee is liivo aaa ee  If I run sendmail -bt and 3,0 liivo aaa ee,
it ok, but with liivo bbb ee it says that in ruleset 96 input is
liivo bbb ee and output is liivo server aaa ee, what must I do? Coult you
help me?

With best regards,
Liivo.