Email Issue

Another thing that helps is making sure your "from" header matches the actual domain that you're sending email from.

If the server is www.yourhost.com, and you send an email from it as "From: [email protected]", the domain names don't match and many ISPs will flag it as spam, or worse just not deliver it.

Personally, I'd use a 3rd party mailing service like sendgrid or something, where they take all of the complexity out of sending email and have a VERY high deliverability rate TO the inbox.