At 17:12 29/07/99 MYT, you wrote:
>I saw this in /var/log/maillog
>
>Jul 30 01:51:53 students sendmail[1558]: BAA01558: ruleset=check_mail, 
>arg1=<[EMAIL PROTECTED]>, relay=eng@[202.184.36.9], reject=451 
><[EMAIL PROTECTED]>... Sender domain must resolve
>
>Whats happening here ?
>I can sent the mail out but cannot recieve mail.
>
>Any idea ?

You need to use the "accept_unresolvable_domians.m4" macro included with
your sendmail source code. The page
"http://www.sendmail.org/virtual-hosting.html"
will get you started on how to build sendmail.cf from m4 macros. 
[Hint:- FEATURE("accept_unresolvable_domains")dnl ]

Although by doing this you may expose your host to abuse by spammers since 
they often use temporary (therefore probably unresolvable) addresses.

hih
nick@nexnix

>-lz
>
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