This plugin Override the function to use CheetahSender SMTP instead of wp mail function..
You should be CheetahSender customer for using this plugin, you can't define your own SMTP, for this you might use another plugin ie wp-mail-smtp.
Deactivate the plugin through 'Plugins WordPress..
Delete the plugin through 'Plugins WordPress.
Notice that, it will reconfigure SMTP WordPress Options...
Activate the plugin through 'Plugins WordPress...
If other plugins you're using are not coded to use the function but instead call PHP's mail function directly, they will bypass the settings of this plugin.
Normally, you can edit the other plugins replace the mail and this will work.
It's up to you, by the way, it looks like hardcoding WordPrfess Core...
Browse the code, check out SVN repository, or subscribe to the development log by RSS...
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