[RFC] 4959 [Name] IMAP Extension for Simple Authentication and Security Layer (SASL) Initial Client Response [Capability name] SASL-IR (L) [Agorum Core] no [Apache James] yes [Archive​opteryx] yes [Axigen] no [Citadel] no [Communigate Pro] yes [Courier] no [Cyrus] v2.2 [DBMail] no [Dovecot] v1.1 [GMail] yes [IceWarp] no [Isode] yes [Kerio Connect] no [MDaemon] no [Microsoft Exchange] no [Oracle] v7.0 [UW-IMAP] yes [Zimbra] yes [WinGate 7] 
yes