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...ion method for all my externally reachable endpoints for some time under the theory that they cannot be hit with a dictionary attack. Unfortunately, this means iOS devices cannot log in since they (oddly) cannot use GSSAPI. I say ?oddly? because desktop Mac mail can use GSSAPI just fine and https://samuelyates.wordpress.com/2013/10/11/kerberos-single-sign-on-in-ios-7/ goes through how to set it up for web pages. In any event, what I?m looking to do is use a filter (https://wiki.dovecot.org/ConfigFile#Filters) around the auth_mechanisms such that it will allow plain authentication when the client is on a...