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Outlook for Android reports "Your mail certificate is invalid. Would you like to login anyway?"

After doing some maintenance on my mail server, Outlook for Android started bitching about my certificate. My certificate was fine. 

The problem is that my IMAP server, Dovecot, has discontinued support for the shitty SSLv2 protocol, which is a good thing.

In the Dovecot config, I set ssl_min_protocol to TLSv1. Unfortunately the Android app does not support TLS, so it was unable to negotiate a secure transport. 

To resolve this issue, I changed the minimum to SSLv3, which is bad, but it works for now.

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