Hello all, Overview and History I've had a custom domain that I've recently migrated from GSuite to Zoho. I've enabled IMAP on my accounts and I'm able to connect to them with Mail for Windows 10 without issue. I've used Thunderbird in the past to connect to this domain when it was hosted by Google, but I have had many issues with Thunderbird after the migration. Most of these I've resolved after removal and reinstall of Thunderbird. Current Issue When setting up my account after a fresh install, it wants to imap.zoho.com which in incorrect for custom domains. See attached. When I configure it manually to imappro.zoho.com and smtppro.zoho.com it fail to log-on. it states possible wrong credentials, which they are correct. I cannot get past this point.