From: Benjamin Donnachie (benjaminpy-soft.co.uk)
Date: Fri Jun 01 2007 - 14:05:33 CDT

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Wietse Venema wrote:
> Why does the mail bounce?

Bounces are very rare - usually less than one a month and caused by a
user being over quota or postfix accepting mail for a recipient listed
in /etc/passwd which doesn't have an account with cyrus.

> Are you accepting spam/viruses/non-existent recipients, and then
> sending backscatter bounces into the Internet?

Definitely not - most rejects are handled during the connection phase.
I've additionally got ClamAV as a content filter which silently kills
any viruses it may find.

> If you can deliver mail directly to remote MX hosts, why are you
> using the ISP's server?

I can deliver directly to most, but a few cause a problem. Being on a
dynamic IP range I've chosen to deliver through my ISP.

> If you can't deliver mail directly to remote MX hosts, your bounces
> will be lost.

They've got more chance of getting through if I deliver them direct
rather than through my ISP which will kill them instantly.

It would be easier if there was a postfix equivalent of the cyrus smmapd
utility - it basically reports via tcp whether a mailbox exists and
whether it is unavailable due to being over quota.

It's no drama - I'll eventually move over to LDAP and use a policy
service for over quota conditions. But, at this stage, my site is
definitely in the hobby category and I can't justify spending the time
to set it up for negligible benefit.

Take care,

Ben

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