"unable to send e-mail" but user and admin are receiving e-mails [#679640]

Hi.
Drupal 6.15
Support 6.x-1.3

I'm getting "Unable to send e-mail. Please contact the site administrator if the problem persists" error when creating a new ticket, or leaving a comment on a ticket. The e-mails are being received by the ticket poster, and the admin so I'm not sure why it is throwing this error. I get the error and receive e-mails (poster and admin) when a ticket is created, and when a ticket is commented on.

Below is the information I got from the log in Drupal -- I am using shared hosting and am not certain how to access error logs.

Details
Type mail
Date Friday, January 8, 2010 - 11:56pm
User Admin
Location http://qwodev.kristinahall.ca/comment/reply/53
Referrer http://qwodev.kristinahall.ca/comment/reply/53
Message Error sending e-mail (from info@qwodev.kristinahall.ca to ).
Severity error
Hostname 216.246.254.125
Operations

Comments

Comment #1

GeekyLass commented 17 January 2010 at 22:49

Priority:

Normal

» Critical

This is still ongoing.

Comment #2

jeremy commented 18 February 2010 at 01:31

Project:	Support Ticketing System	» Drupal core
Version:	6.x-1.3	» 6.x-dev
Component:	User interface	» mail system
Category:	bug	» support
Priority:	Critical	» Normal

This error is generated by the drupal_mail() function in the core mail.inc include file. This error happens when drupal_mail_send() does not return anything. Check the mail logs on your server, this is not an issue with the support module.

Re-assigning this as a support request against the core Drupal mail system.

Comment #3

tbeckett commented 26 March 2010 at 12:21

Same issue. To give some more detail on my configuration in case that holds some key to the issue, I am using mimemail and phpmailer with a google enterprise backend email account.