Ben

@guillaumemolter the conflict here seems easily resolved. Is there anything else preventing merge? Does it require more testing?

@atheken, Thanks for your prompt response. I'd be glad to assist with further testing on single and multi-site installs if that's useful.

@atheken In a multisite environment the Postmark settings should appear on the main "Network Admin" dashboard under Settings (http://siteurl.com/wp-admin/network), and not on the individual site's Settings menu. Is it not...

@atheken In my testing, it appears that this PR removes the Postmark option screen from each individual site's Settings menu, but also, as @guillaumemolter noted, does not add it to...