Hi,

I need the ability to approve outgoing emails before they are sent, for reasons such as attachment size, email content etc.

I was hoping there'd be a way to configure postfix to do this but so far I haven't been successful.


Ideally I could create an IMAP+SMTP email server on our Network which I could provide a front end for such as roundcube, when users send emails they are actually queued until approval, at which point they are either sent or rejected. The rejection wouldn't need to provide notification, I don't mind doing that manually.

Hopefully that's a decent explanation.


I've looked high and low for such a solution so if someone knows of one I'd be very appreciative. Thanks!

the access(5) man page documents a HOLD action. might that be what you're looking for?

Hi, thanks for the suggestion. I'd previously tried that but when sending a test email the email sending looped until it timed out without it being accepted which seems a bizarre behaviour.

I made the following changes to implement it:


/etc/postfix/main.cf:
smtpd_client_restrictions =
check_client_access hash:/etc/postfix/access

/etc/postfix/access:
192.168.0 HOLD

you have some diagnosing to do, then. once something is in the hold queue, it will not be retried.
you might want to review your logs to understand what is happening.