Caused by: com.sun.mail.iap.ConnectionException: * BYE Jakarta Mail Exception: java.lang.ArrayIndexOutOfBoundsException

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javax.mail.MessagingException: * BYE Jakarta Mail Exception: java.lang.ArrayIndexOutOfBoundsException
at com.sun.mail.imap.IMAPStore.protocolConnect(IMAPStore.java:714) ~[jakarta.mail.jar:1.6.4]
at javax.mail.Service.connect(Service.java:342) ~[jakarta.mail.jar:1.6.4]
at javax.mail.Service.connect(Service.java:222) ~[jakarta.mail.jar:1.6.4]
at javax.mail.Service.connect(Service.java:171) ~[jakarta.mail.jar:1.6.4]

Caused by: com.sun.mail.iap.ConnectionException: * BYE Jakarta Mail Exception: java.lang.ArrayIndexOutOfBoundsException
at com.sun.mail.iap.Protocol.handleResult(Protocol.java:418) ~[jakarta.mail.jar:1.6.4]
at com.sun.mail.imap.protocol.IMAPProtocol.handleLoginResult(IMAPProtocol.java:1043) ~[jakarta.mail.jar:1.6.4]
at com.sun.mail.imap.protocol.IMAPProtocol.authntlm(IMAPProtocol.java:842) ~[jakarta.mail.jar:1.6.4]
at com.sun.mail.imap.IMAPStore.authenticate(IMAPStore.java:895) ~[jakarta.mail.jar:1.6.4]
at com.sun.mail.imap.IMAPStore.login(IMAPStore.java:800) ~[jakarta.mail.jar:1.6.4]
at com.sun.mail.imap.IMAPStore.protocolConnect(IMAPStore.java:681) ~[jakarta.mail.jar:1.6.4]

* OK The Microsoft Exchange IMAP4 service is ready.
DQ0 CAPABILITY
* CAPABILITY IMAP4 IMAP4rev1 AUTH=PLAIN AUTH=NTLM AUTH=GSSAPI SASL-IR UIDPLUS MOVE ID UNSELECT CHILDREN IDLE NAMESPACE LITERAL+
DQ0 OK CAPABILITY completed.
DEBUG IMAPS: AUTH: PLAIN
DEBUG IMAPS: AUTH: NTLM
DEBUG IMAPS: AUTH: GSSAPI
DEBUG IMAPS: protocolConnect login, host= --- remove this info.
DEBUG IMAPS: mechanism PLAIN disabled by property: mail.imaps.auth.plain.disable
DEBUG IMAPS: mechanism LOGIN disabled by property: mail.imaps.auth.login.disable
DEBUG IMAPS: AUTHENTICATE NTLM command trace suppressed
DEBUG NTLM: type 1 message: 4E 54 4C 4D 53 53 50 00 01 00 00 00 03 B2 08 00 05 00 05 00 2F 00 00 00 0F 00 0F 00 20 00 00 00 64 63 6D 69 64 61 76 70 73 69 63 30 30 32 37 4E 41 4D 51 41
DEBUG NTLM: type 2 message: 4E 54 4C 4D 53 53 50 00 02 00 00 00 0A 00 0A 00 38 00 00 00 05 82 89 02 C8 6D 6E C1 CF D8 FE C3 00 00 00 00 00 00 00 00 06 01 06 01 42 00 00 00 0A 00 39 38 00 00 00 0F 4E 00 41 00 4D 00 51 00 41 00 02 00 0A 00 4E 00 41 00 4D 00 51 00 41 00 01 00 1A 00 44 00 43 00 57 00 49 00 54 00 50 00 45 00 58 00 43 00 4D 00 30 00 30 00 35 00 04 00 3A 00 4E 00 41 00 4D 00 51 00 41 00 2E 00 43 00 4F 00 52 00 50 00 51 00 41 00 2E 00 47 00 45 00 55 00 43 00 2E 00 43 00 4F 00 52 00 50 00 2E 00 47 00 4D 00 2E 00 43 00 4F 00 4D 00 03 00 56 00 44 00 43 00 57 00 49 00 54 00 50 00 45 00 58 00 43 00 4D 00 30 00 30 00 35 00 2E 00 4E 00 41 00 4D 00 51 00 41 00 2E 00 43 00 4F 00 52 00 50 00 51 00 41 00 2E 00 47 00 45 00 55 00 43 00 2E 00 43 00 4F 00 52 00 50 00 2E 00 47 00 4D 00 2E 00 43 00 4F 00 4D 00 05 00 2E 00 43 00 4F 00 52 00 50 00 51 00 41 00 2E 00 47 00 45 00 55 00 43 00 2E 00 43 00 4F 00 52 00 50 00 2E 00 47 00 4D 00 2E 00 43 00 4F 00 4D 00 07 00 08 00 8F 2E 74 FF 78 85 D7 01 00 00 00 00
DEBUG NTLM: Using NTLMv2
DEBUG IMAPS: IMAPStore non-store connection dead
DEBUG IMAPS: AUTHENTICATE NTLM command result: * BYE Jakarta Mail Exception: java.lang.ArrayIndexOutOfBoundsException

Start with the NTLM authentication path in IMAPProtocol.authntlm and IMAPStore.authenticate, then follow Protocol.handleResult in Protocol.java. Reproduce the failure against the Microsoft Exchange IMAP service described in the trace and determine the cause of the ArrayIndexOutOfBoundsException. Done means the connection no longer fails with this exception and the behavior is covered by a regression test.

Written by the indexing model from the issue text.