Compatibility Issues

Hi @jordanrevell28,

Thanks for getting in touch. This plugin has been tested on WordPress v5.5.3 prior to updating the tested up to version (just tested again on a fresh 5.5.3 instance as well to double check). We also have not received any other similar reports.

Sometimes this can happen if you have a plugin installed that conflicts with Postmark, such as another plugin that overrides wp_mail. I recommend checking for conflicting plugins and your WordPress instance’s error logs to see if you can spot the issue.

Please reach out to us at [email protected] if you have any questions or want to provide any additional information.

Thanks,

Patrick

We found the same issue on our site. Installed plugin, but no settings visible. Only “General”, “Send Test Email” etc tabs were visible, but none of them worked.

The theme framework (Bones) has a function that removes a lot of “unnecessary” WordPress features like RSS links, parent post links, etc.

The one causing the issue was something at removes the default version number for loaded scripts. /js/script.js?ver=5.3.3 becomes /js/script.js. When removed the remover, Postmark started working. So it seems that postmarkapp requires the version number on the generated WordPress scripts.

These are the lines we Removed from our theme

	// remove WP version from css
	add_filter( 'style_loader_src', 'bones_remove_wp_ver_css_js', 9999 );
	// remove Wp version from scripts
	add_filter( 'script_loader_src', 'bones_remove_wp_ver_css_js', 9999 );

And the function itself

// remove WP version from scripts
function bones_remove_wp_ver_css_js( $src ) {
    if ( strpos( $src, 'ver=' ) )
        //$src = remove_query_arg( 'ver', $src );
    return $src;
}

Great info – thanks for sharing @grant10k!