[exim] SMTP-Auth TLS/SSL

hello,

Im having great difficulties with getting this to work. I have a
working system, everything was ok, users not on the internal network
could connect with their outlook set up with SSL on and smtp on port
465. Exim would authenticate the user and deliver the message to the
mailbox.

Now, it still authenticates ok, but gives me this error.

451 Temporary local problem - please try later

In the exim mainlog I get this:

F=<email@???> temporarily rejected RCPT <TO.User@???>

Nothing has changed in exim, and the server 's dns is correctly setup,
reverse and forward lookups are working.

Can anyone help, authentication is ok, it sound like a dns problem.
Thanks,
Ian