subscribe2 sends out two messages for each post

@karlrt,

Have a look here:
https://subscribe2.wordpress.com/2013/09/17/troubleshooting-emails-in-subscribe2/

And maybe try the email logging plugin.

The problem seems to be with the “publish to schedule” plugin. Once deactivated, only one email goes out. Do I need to do anything to get this on the list of known conflicts?

@karlrt,

Having reviewed the code thanks to your excellent work narrowing down the issue I think I understand the problem and may even have a fix.

Try this, in the classes/class-s2-core.php file find these lines:

$statuses = apply_filters( 's2_post_statuses', array( 'new', 'draft', 'auto-draft', 'pending' ) );
if ( 'yes' === $this->subscribe2_options['private'] ) {
	foreach ( $statuses as $status ) {
		add_action( "{$status}_to_private", array( &$this, 'publish' ) );
	}
}
array_push( $statuses, 'private', 'future' );
foreach ( $statuses as $status ) {
	add_action( "{$status}_to_publish", array( &$this, 'publish' ) );
}

And edit that to:

$statuses = apply_filters( 's2_post_statuses', array() );
if ( 'yes' === $this->subscribe2_options['private'] ) {
	foreach ( $statuses as $status ) {
		add_action( "{$status}_to_private", array( &$this, 'publish' ) );
	}
}
array_push( $statuses, 'private', 'future' );
foreach ( $statuses as $status ) {
	add_action( "{$status}_to_publish", array( &$this, 'publish' ) );
}

Notice the array in the first line is now empty. If that works and allows you to use the two plugins together let me know and I’ll post a more permanent solution that will be preserved through upgrades.

Yes it worked indeed with my testing environment!

I will not try it on my productive site, just disabled the publish to schedule until this gets fixed with a proper update ??

@karlrt,

Great news that the fix worked. If you really need the Publish to Schedule then the more permanent fix is now detailed on the Conflicts page.

Unfortunately, there isn’t really a way to account for this and fix it in the Subscribe2 code so the site specific plugin code is probably the best way to allow use of both plugins.