Re: [exim] Very loosely Exim related! - Need help reading he…

On 03/05/2006 16:25, Gareth Hastings wrote:
> We recently had a user send out an email to a huge list of very badly
> formatted emails
<snip>

It looks (from experience) like you've been a victim of not only idiocy
- fairly low-level - from one of your users, but also some idiocy
outside your control.

It's possible to utilise "remote mail", "remote pop", "mail pickup"
services like fetchmail or similar connectors or collectors for
commercial applications like Exchange or Communigate. They login to a
remote POP server, fetch messages from a given account (or more than
one), then deliver them to local mailboxes.

In theory.

If they're badly configured, then they can in effect act as arbitrary
relays. In your case, someone (or more than one) in the initial
recipient list is using something like this. Their server has fetched
their message correctly, but has then parsed the "To:" line and
re-delivered it to the entire recipient list.

As you can imagine, this can go round, and round, and round for ever.

This is the giveaway in one message:

Delivered-To: halyard-mspop3connector.jgrazebrook@???

I hope that helps. A bit. I feel your pain on this one :(

Graeme