This error message -commonly associated with the use of phpMailer- can have different causes (sometimes platform related) and could be a bit hard to troubleshoot if you don't narrow it down.
This is an (incomplete) overview of causes mentioned in the forum and bug tracker:
* A configuration error of the phplist pageroot value in config.php
Ref:
http://forums.phplist.com/viewtopic.php?p=15761#15761
* An invalid email address in your user list.
Ref:
http://mantis.phplist.com/view.php?id=5385
* A bug in phpmailer/class.phpmailer.php, which presumably has been fixed by now (since ver. 2.10.3 I believe).
Ref:
http://mantis.tincan.co.uk/view.php?id=4756
* Another bug discovered in class.phplistmailer.php, when using phpmailer in combination with SMTP. This bug is still valid for ver. 2.10.4 [EDIT: and version 2.10.5]
Ref:
http://mantis.phplist.com/view.php?id=8590
When using SMTP with a non-standard SMTP port, you may get this error message:
Quote:
Mailer Error: Language string failed to load: connect_host
In this case you might fix this by applying this mod:
http://mantis.phplist.com/view.php?id=11493
and adding a line similar to this in config.php: $phpmailer_smtpport = '587';
* An incompatibility between phpMailer and Windows/IIS, obviously only relevant if you are on a Windows/IIS platform.
Ref:
http://www.u-g-h.com/index.php/2007/...-issue-on-iis/
Most of these reports include suggested fixes. There might be more though, try searching the forum for that error message.
A number of users mentioned that disabling phpmailer in config.php, solved the problem for them.
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