I am continually experiencing 'invalid user' rejections, yet they exist in both Exchange and Cuda portal. Support says its the ldap not responding quickly enough. This may be being caused by the 1000's of spam mails being received daily to non existant accounts.
So a) if the user doesn;t exist does cuda still try to validate via ldap ?- thus overloading the lookup.
and how can I prevent this happening as support just say its 'not their problem' - yet the cuda service accepts a mail and 30 secs later rejects and bounces back a second mail to the same user....
This has got the point where we are seriously considering binning the cuda service.
thanks in advance for any responses.