Hi,
I am not familiar with Sendmail in Linux Fedora Core. I would like to allow a particular e-mail in a specific email account and block the rest,how would I do that. What are the commands to be used. It is of much help if you can provide me a step by step procedure since I have a little knowledge on this area. Thank You

I can't really understand what it is you are trying to accomplish.

Do you want to send an email to a specific address, but not any other address? Do you want only 1 email account on the system to be able to receive all email sent to a particular domain? Do you want only 1 email address to receive email on a given system and all other email to be silently dropped or rejected?

Could you elaborate on what you want...

Thanks!

Cool

I would like to receive only e-mails from a certain sender and then block the rest. how would I do that? However, this would only be applied to a single account in the server.

You could do this with procmail, a rule like:
:0
* ^From: somebody@somewhere.com
.Inbox/

And trash anything else with a procmail trashing everything else:
:0
* ^From: *.*
/dev/null

Take note, I've not tested this, but from my understanding this should work. A few test emails should help to see if it actually does As procmail processes recipes in order, if you have these in this order, it *should* work.

You might get spam if the person is someone like:
root@yourdomain.com
that you allow through, just an FYI. I don't know of an easy way to get around that, other than to use spam checkers and then filter the spam through first, then apply these last procmail recipes. See:
http://www.ii.com/internet/robots/procmail/qs/
For more info on using procmail recipes.

One last thought:
~/.procmailrc (and possibly ~/.procmail/) is where these recipes go, this will only affect the user who has them in their home directory.

Good luck!

Cool

ok.thanks a lot.