Originally Posted by khwaish
this forum is about the discussion of sendmail server. after configuring sendmail.mc , i am not able to syncronise it in sendmail.cf. while sending a mail its giving an error msg unknown user & service unavailable.
No, this is the Linux - Newbie forum, not the sendmail forum. You're going to have to actually provide some useful information, such as the exact error message, version/distro of linux and sendmail you're using, and what you're trying.
How are you trying to generate the sendmail.cf, and 'synchronize' it?