I recieved a mail from email@example.com today titled "Thanks for participating on Stack Overflow!"
I wanted to feedback that this hit my junkmail folder (on Hotmail).
I'm not concerned about the mail itself, and I'm sure it's not junk, but you guys might want to know that it's being seen as junk by Hotmail.
I subsequenty verified my email address on Careers, and then paid to be listed. Both mails associated with these actions ended up as junk. I've now flagged SO mails as "safe". Very little else ends up in my junk mail (i.e. I don't think I have an overly agressive junk mail filter). Perhaps I'm in a minority, but it would be worth investigating why these mails get flagged as it could cost you business or reputation.