Tell Gmail, Yahoo, Hotmail your server is used for sending eDM
T=remote_smtp defer: retry time not reached for any host
If you get this error when you are trying to send email to Yahoo. It is very likely that your server ip is black-listed.
You can contact yahoo postmaster by filling in the form here: http://help.yahoo.com/l/us/yahoo/mail/postmaster/errors/?referrer=blog.my-helper.com
Another easier solution is to change your server IP.
Emails get into Hotmail junk box
The problem could be solved by:
- Adding Message-ID to the header
- Encoding the subject in base64 form:
$subject = ‘=?utf-8?B?’ . base64_encode(‘EMAIL SUBJECT’) . ‘?=’;
- Using php mail() function instead of PHPMailer