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I suspect the problem is in the xoopsmailer and xoopsmultimailer, or the combination of them - and possible some expectations from module-developers thats not beeing met.
I believe the error can happen on all protecols, but I've only tried the PHP mail().
Both xoopsmailer and xoopsmultimailer have the phpmailer (which contains class.phpmailer.php and class.smtp.php) as underlaying layer.
Phpmailer is a seperate project (
http://phpmailer.sourceforge.net/), used by many other open source projects, and it's been stable (or at least unchanged) at version 1.73 for quiet some time. I'm quiet sure it's not where the problem lies.
The reason I've made changes to the class.phpmailer.php is only that it's the final destination for the message, headers etc. before it leaves the control of xoops.
The output shows errors, but not where those errors are comming from.
Peekay, you could try to go to the admin section, and in the system-popup, select to send mail to your users.
I'm quiet sure it will fail when you send out the message.
Best regards,
Daigoro