Zoho Mail Plugin stopped working

I’ve been using the Zoho Mail plugin for several months without issue. I have a Zoho Mail email with my website domain: customerservice@elcheapoflags.com.

I use that email customers and also set up my wordpress website to send out notification emails with the plugin. Notifications such as New Order, Your Order Is Processing, etc. It has been working brilliantly and then my website stopped sending emails. None are successful. This occurred on April 15th.

I also have one contact form on my homepage that uses WP Forms and messages via that also stopped working.

When I test emails through Site Health tools it says it was sent but does not arrive.

I downloaded a plugin (Check & Log Email) and sent a test and it sent and actually arrived – which means my website can send emails and my host is not stopping the emails from being sent.

I’ve tried reauthenticating the Zoho Mail plugin, deleting and reinstalling and nothing works. It says successful and no issues but emails do not arrive/get sent. What I did notice is the two dots are not checked like they should be during authentication for Zoho Mail Plugin: https://snipboard.io/89RJIX.jpg

I have emailed Zoho Mail Support for the past 3 days without a response…I want to fix this and continue to use Zoho – it has been great up until it stopped working. I am a paying customer for Zoho Campaigns so don’t want to have to reset up an entirely new system of emails from the website, customer service email processing and email newsletters. Hopefully I won’t have to.

Any suggestions? It seems like a change occurred at Zoho Mail on April 15th.

P.S. I have deactivated, tested and reactivated all plugins relating to emails and this did not get Zoho Mail plugin to start working again.

The page I need help with: [log in to see the link]