Originally Posted by alpha5000
I'm assuming that PHP is sending through an MTA (postfix,sendmail,etc. ). Any way for you to take a look at the MTA logs? It's possible that your server is being deprioritized and the message is just sitting in the queue and has never left (even though as far as PHP is concerned, it has been sent).
Ahh thats the issue i guess, looking at the log and it says the following:
temporarily deferred - 4.16.50. Please refer to http://help.yahoo.com/help/us/mail/defer/defer-06.html
looked at http://help.yahoo.com/l/us/yahoo/mai...master-01.html
to see if i can fix it and since im getting error 421,
- 421 Resources temporarily unavailable. Please try again later.The Yahoo! Mail MTAs are temporarily too busy. Your server should try to resend the message after a few minutes.
But they sit in the queue for days upon days and never leave.
451 Message temporarily deferred - 
- 451 VS1-IP Excessive unknown recipients - possible Open Relay More information (#4.1.8)
- 451 VS1-MF Excessive unknown recipients - possible Open Relay More information (#4.4.5)
Not sure whats even going on with that, none of the "more information" applies to me.
Its sending as email@example.com
(replaced my actual website with that URL) but composed as firstname.lastname@example.org