Re: Not getting activation email
Emails are *not* a WordPress issue. They are 99.9% issues with the host or your ISP. Every. Single. Time.
The reason they get dumped into trash or blocked by your ISP is becasue they are sent thru php mailer and have different header son them. Which is entirely due to the way your box is set and (as repeatedly mentioned) the way your ISP handles them on receipt.