This is from my Mail.app “Connection Doctor” when talking to GMail; I am not sure – it could be a Ricky Nelson quote, or a Reba Mcentire quote, or a morphed reference to The Office (US) …
But it is a bit weird – not on par with “Avast, ye scurvy dogs!” or whatever some places used to respond to fake HELO SMTP strings in sendmail, but nowadays we take humour where we can get it.
READ Nov 13 14:24:58.090 [kCFStreamSocketSecurityLevelNegotiatedSSL] -- host:imap.gmail.com -- port:993 -- socket:0x17a89750 -- thread:0x19113450
* CAPABILITY IMAP4rev1 UNSELECT IDLE NAMESPACE QUOTA XLIST CHILDREN XYZZY
1.23 OK Thats all she wrote! m27if606389pof.20