Bad Request(invalid_grant)

Hi Jason, Recently, I had two sites stop sending email due to a “Bad Request(invalid_grant)” error. Unfortunately, these were client sites and it happened in between my regular maintenance cycle, so they missed contact requests from potential customers. I reset the OAuth credentials and it worked again. I noticed that when I went through the setup wizard, the Port was set to 587, where previously it was 465. I’m wondering if that is significant??? Maybe Google changed something where port 465 no longer is preferred? Have you seen other issues like this?

I also have Wordfence installed on those websites, just in case that might be an issue.

Thanks for your help. I have been using your plugin for a long time and it’s invaluable.