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Per discussion in #6, here is an implementation of converting IMAP keywords to GMail labels. I've tested it on about a year's worth of my corporate email (~3k messages), moving from Zimbra to GMail (really GSuite) which contained about 20 unique tags. That process made me add an
--excludetags
option to skip porting some of Zimbra's internal IMAP keywords (second commit on this branch). I also tested that Zimbra (the IMAP server I have easy access to) doesn't barf too badly if I attempt to use theX-GM-LABELS
command (it simply rejects it as an invalid store command but allows the client to continue issuing other commands).I have attempted to match the coding style of the existing code, but let me know if I missed anything really important...
Possibly useful reference material: