Have you checked the settings of the plugin? Can you send a picture?
WordPress sends your other emails?
Send a picture of what? the settings? I do not know what you mean by “WordPress sends your other emails?”
Actually I was having difficulty with a different plug-in that the emails would not send. I think a scripting issue but was not able to solve it and I thought this one might be different.
Then Pq is your server blocked the use of emails.
I’m doing another plugin for that, is not yet in the repository but you can download on github.
https://github.com/valeriosouza/my-smtp-wp
Configure an SMTP email provider, like Gmail, Live, Hotmail and Yahoo. Or even your email hosting.