Hi everyone.

We've long been a good outgoing mail provider, and all of our mail 
servers have restricted outgoing mail to two different methods:

1. Our client has an IP address that belongs to a certain set of IP 
ranges.
OR
2. Our client logs in with authenticated SMTP.

However, I just noticed that over the weekend our new Zen loadbalancer 
has turned our carefully laid plans on their ear, since its IP address 
belongs to rule number 1 there. As far as our mail server is concerned, 
any connections made through the loadbalancer are allowed to send e-mail 
far and wide.

Well, now that I've shut *that* down (thankfully, the system isn't live 
quite yet), we now have to figure out a plan for letting our thousands 
of customers send e-mail through a highly available mail server, but 
without having to change them all to authenticated SMTP, because that's 
a tech support nightmare.

Any ideas?

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