Proof Gmail IMAP (Gimap) supports IMAP IDLE

So for those of you with capable mail clients (like OS X Mail.app), here’s proof that IMAP IDLE works for delivering push mail:

$ openssl s_client -connect imap.gmail.com:993 -crlf
* OK Gimap ready for requests from 1.2.3.4 0123456789abcdef
. capability
* CAPABILITY IMAP4rev1 UNSELECT IDLE NAMESPACE QUOTA XLIST CHILDREN XYZZY
. OK Thats all she wrote! 0123456789abcdef
. login samj@samj.net letmein
. OK samj@samj.net authenticated (Success)
. examine inbox
* FLAGS (\Answered \Flagged \Draft \Deleted \Seen)
* OK [PERMANENTFLAGS ()]
* OK [UIDVALIDITY 2]
* 4498 EXISTS
* 0 RECENT
* OK [UNSEEN 1431]
* OK [UIDNEXT 25141]
. OK [READ-ONLY] inbox selected. (Success)
. idle
+ idling
---mail sent and deleted here---
* 4499 EXISTS
* 4499 EXPUNGE
* 4498 EXISTS

This is invariably why some clients ‘feel’ more responsive than others, and why you should find an IMAP IDLE capable client.