Hi there,

I have registered a free account today and I got the SMTP working under the free plan.

Then I tried to upgrade my plan. At the first time, I cancelled the transaction due to the insufficient balance in my PayPal. And then I found the SMTP stopped working. I got Authentication Failed (535) error.

I thought that this maybe caused by the cancelled transaction. After a couple of hours, I upgraded my account again and this time, I finished the transaction and my account is Mail Lite. And the SMTP is still not working. I still get Authentication Failed (535) error.

I have set up the SMTP using Apple Mail, and followed the following instruction.

Outgoing Server Name  smtp.zoho.com.au