I can't find any information about the status of IMAP version 4 and how widely it's used nowadays and how widely other versions, 1, 2 and 3 are used.

So is IMAP version 4 common these days? What about other the versions 1, 2 and 3?


Restricting this to the commonly used Linux servers:

They all support IMAP4, since the IMAP4rev1 RFC was defined more than 10 years ago, I don't think you'll find the older version still being used.

  • IMAP4 hasn't been released yet? – Oskar K. Apr 28 '16 at 8:03
  • Depends on how you define released. These things are done as RFC once they are published, I would consider them released. – Anthon Apr 28 '16 at 8:10
  • There are also mail clients that support it client side. E.g. Alpine. But I don't know if they have versioned support. – Faheem Mitha Apr 28 '16 at 8:16
  • doesn't "ver1" imply that it's a draft version? or am I confusing it with "rev"? – Oskar K. Apr 28 '16 at 8:33
  • @OskarK. revision 1 is, I would assume the first revised version after the IMAP4 base version. RFC 1730 from 1994 is IMAP4 without revision. A revision 1 is not the same as beta 1 as used in software releases. – Anthon Apr 28 '16 at 8:40

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