How can I set up an email user as "send-only" (no mailbox for receiving)?

Can anyone tell me how I can set up an email account that can send emails but not receive emails.
Our Web application has been using a generic email address "[email protected]" in all of our PHP Web applications as the sending email account. I have this user set up in WORKGROUP ADMIN as a proper account. However the account gets tons of SPAM emails and is constantly filling up.
Also, all of the email accounts require SMTP authentication to send emails.
Is there any way to identify an account as a send only account so we can generate emails from our Web applications that cannot be replied to?
Thanks for the help
-- Jon

Doing so will cause issues. If you send out mail which to an outside server appears to be non existent, mail may be rejected and you may even be blacklisted.
You can remove the account from WGM and add a role account as an alias send to /dev/null. This will look to the outside world like an existing address, but simply be discarded on your system. You should however include a working address in your mailings for people to be able to respond.
Assuming you use local domains, edit /etc/postfix/aliases and add:
noreply: /dev/null
(you can change noreply with the sender used in your PHP apps, but I'd probably change the PHP apps to use noreply as this signals to people receiving your mails that this address is unattended).
When done, issue:
sudo postalias /etc/postfix/aliases
sudo newaliases
sudo postfix reload
HTH,
Alex

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