6 copies of messages going to every user?

Do users appear in multiple groups? It shouldn’t matter as the plugin will remove duplicate addresses, or it is supposed to, when composing the headers.

You can use the DEBUG functionality to take a look at the message headers that are built without actually sending the emails. When you enable debug, the actual message you compose is never sent, instead it is “intercepted” and the headers and some other information is displayed on the Dashboard.

I would start there and see what the headers look like. Do all of the addresses actually appear twice or is something else happening.

Marking resolved due to lack of additional information.

Sorry for not following up. I’m still attempting to figure this out. I did a test with Debug mode on. I thought with Debug mode on, it wouldn’t send emails but my test did go out and we got 6 emails with the test. To answer the questions above –

1 – Each user is in one of three roles. There are no users with multiple roles.
2 – All of the addresses when I look at the Debug results are unique. There are no duplicates.

Is there any incompatibility that you’re aware of with the Membership plugin from WPMUDev or perhaps with the Nav Menu Roles? Can’t think of any others that would interact with user roles. I have three user roles.

The fact that you got 6 emails even when debug mode is on makes it sound like another plugin is also overloading wp_mail() and doing something that Email Users isn’t expecting.

Have you tried disabling the Memebership plugin and see if the problem still happens? Narrowing it down to a particular plugin will be helpful, it is almost certainly some sort of conflict.

A plugin conflict does make sense to me. I don’t think it’s the membership plugin because have that same combination of Membership plus Email Users on other sites that seem to work fine. I may be using a different SMTP mailer on the other site, so I wonder if that could be the problem? I’ll start disabling plugins that are different on this site versus the other one that works. Both sites are updated with the latest version of WP and Email Users.

Thanks for your reply!