Hi,
I have wpmu running successfully but activation emails are not being received for all new users. To test the problem myself, I have created new users with six distinct email providers and found the following results:
i) Gmail accounts --- activation emails received with no problem
ii) my .edu account --- again, no problem
iii) my hosting provider account --- again, no problem
iv) Hotmail accounts --- again, no problems
v) Yahoo email accounts --- emails ***NOT*** received
vi) GMX email accounts --- emails ***NOT*** received
In the case of the last two trials, I did look in Spam folders and no email messages were found. There is no sign of those activation email messages anywhere.
Why would the activation emails be received by only 4-out-of-6 email providers??