Hello! > domains, or addresses in your domain which should not receive mail: > > badlocaluser@ 550 Mailbox disabled for this username > host.mydomain.com 550 That host does not accept mail > user@otherhost.mydomain.com 550 Mailbox disabled for this recipient In the README of my distribution of sendmail the sign '@' is missed ... Anyway, it doesn't work unless I specify the full user's address : localuser1@my.domain.com Is there anything wrong with my domain and sendmail configuration ... ? And, though it rejects mail now, when I specify full address, it rejects it only after it gets all its body (may be very large).. It would be better to reject the unwanted email immediately , without the need to transfer all it's body... Best regards, Andrei - : send the line "unsubscribe linux-net" in the body of a message to majordomo@vger.kernel.org