Looking at the logs from the server, I see that we are having problems sending emails to users a AOL.com, and bellsouth.net, and presumably any other ISPs on the ATT network.

ATT appear to have blocked the BLUF server for having the temerity to attempt to return the huge volumes of spam arriving from their network; I don't know what's up with AOL, but I am attempting to resolve both problems.

In the meantime, this means that, for example, password reset emails to users at affected ISPs cannot be delivered.

Nigel.

This issue appears to have been resolved for ATT/Bellsouth/SBC users.

And it's now also resolved for AOL users.