What do I do if my IMAP migration reports the error: "Plaintext authentication disallowed on non-secure (SSLTLS) connections"?
You need to change the settings on your IMAP server to allow plaintext over SSL/TLS.
Certain IMAP Source servers disallow plaintext authentication on non-secure SSL/TLS connections.
If this is the case, migrations will report an error similar to the following:
Source: "Your migration failed checking Source credentials. [PRIVACYREQUIRED] Plaintext authentication disallowed on non-secure (SSL/TLS) connections. 278f8931-7104-11e4-9427-001cc8b71cb0."
The exact location of this setting differs between IMAP providers, but it can normally be located under Security Settings.