Send IMAP ID only after authentication #7517
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In case of IMAP proxy, that is doing authentication and routing, receiving ID command may result in
BAD Invalid command
error, as IMAP proxy does not yet know which server should receive the communications. Even if proxies would return correct output for ID command, the "name" field returned would not necessarily be the same as for "name" field value after authenticating.This applies to Nginx + Dovecot stack.
iPhone Mail, Mac OS X Mail, Microsoft Outlook, Thunderbird, and other major (as 30+ minor) MUAs are sending ID command after authenticating, or even delay it until after NAMESPACE.