How to alllow an email address to send email but not recieve emal

Hi,

I am creating an autentication system, i want to turn one of my accounts into a sender account. but stop all external emails from being recieved by it.

 

You could create a new alias in /etc/aliases:

Code:

username: /dev/null

(Replace username with the username of the account.)
Run

Code:

newaliases

afterwards and restart Postfix.

 

is the username with the @mydomain.com??
cause i have tried both with out the @ and with and i can still sendmail to the account.

I tried what u said but i got this instead
[email protected]... cannot alias non-local names

 

It's the system user name of that account (works unless you have a virtual user setup).

 

Is there any work around for a virtual account?

 

You could forward the mail to a system user and then send that mail to /dev/null using the aliases file.

 

but that means mail is still recieved by the virtual email client right?

How do i set up a local account to accept or send mail?
Can i access this local account through pop3 and smtp?

 

Take a look here: http://www.howtoforge.com/forums/showthread.php?t=2

Yes.

 

postconf -e 'home_mailbox = Maildir/'
postconf -e 'mailbox_command ='
/etc/init.d/postfix restart

if i do these commands will all my virtual users be disabled? and only local accounts will recieve email?

do i need to modify any of the values here or i just literally take all the values u stated?

 

If you're currently using Maildir, you can use these settings. If you're using mbox, you shouldn't use them.