Sandip> an error occured while sending mail. the mail server
Sandip> responded: relayin to <debian-user@lists.debian.org>
Sandip> prohibited by administrator. (failed to find hostname from
Sandip> ip address). please check mail receipients and try again
>>
>> I have not seen this one, but most likely you need to look in
>> exim.conf and look at the options that have the word 'relay' in
Sandip> got the gist. how do i solve it? do i have to modify my
Sandip> exim.conf again? well, now i am kind of used to it!
Well, you will have to investigate a little.
Is host_accept_relay set to "127.0.0.1 : ::::1"?