Phpbb email.php error

Phpbb email.php error
The problem is actually on phpBB's side and is really just with the coding.

Here is the fix.
go to the phpBB/language/lang_english/email/ within your site.

edit the file privmsg_notify.tpl and replace everything with this Text:

Subject: New Private Message has arrived
Charset: iso-8859-1

You have a new message at: {U_INBOX}

This will fix the issue.

The exact location of the emailer.php is phpbb/includes/emailer.php.