I've run into something odd with ZP1.4 (build 4682). Whenever I try to confirm registration, I get invalid address error for the Master admin user only. The other admin user(s) receive the notification, no problem.
Now, I've switched master users, checked and double checked email addresses, verified credentials and cross-checked with the contact form. This problem seems to be isolated to the registration confirmation, and the master user only.
The only way I've been able to work around it is to setup a dummy master admin and remove their email address - only then does the invalid address error go away when confirming user registration.
I'm using PHPMailer, but the symptoms seem to be the same with zen_sendmail (little hard to say for sure, I didn't mess with zen_sendmail too much to validate that it was working as expected to begin with).
I'm using email as ID, but tried it the other way with the same results.
The other thing I've noticed with the Register User plugin - it seems when my (non-master) admin user receives their new-user registration notification, it's missing content:
"Oliver () has registered for the zenphoto gallery providing an e-mail address of ."
I hope I'm making some bone-headed configuration error, but can't figure where - I've done everything including dumping the _options and _admin tables to see if there was something amiss.
Any thoughts on this??