use Blat to send mail in local network problem

I am trying to use Blat to send mail in 开发者_如何学编程the local mail server but an error message keeps returning, saying that the SMTP server does not like the sender name.

I have kept trying with different sender names but it's still the same. Does anybody know how to fix it?

I've used blat for sometime to do this. here's the key.

-to 1@foo.bar -f 2@foo.bar -server your.smtp.server-name.bar

what are you using?