Changed primary SMTP addresses now getting a lot of 'valid user' errors

We added a domain and made it everyone’s reply as email address and now RT is kicking out a bunch of:
RT could not load a valid user, and RT’s configuration does not allow for the creation of a new user for this email (
You might need to grant ‘Everyone’ the right ‘ReplyToTicket’ for the queue XXX.
We are using ExtAuth, and Email Completion against 2008 Active Directory. Everything has been working great, until we added this new email domain, and set it as everyone’s primary reply as.
I’ve attached the two config files in case someone wants to dig into it…XXX1 is the original domain, XXX2 is a sister company, and XXX3 is the new domain. We’re only getting the errors when people are sending tickets in via email to from their new XXX3 domain email account. In the mean time I’ve set AutoCreate to 1, but we’re not a fan of cleaning out spam regularly…

Thanks in advance.
-Andy (2.67 KB) (4.58 KB)