Mavericks Mail won't send login information to IMAP server

I am having a problem with Mavericks Mail not connecting to the Dovecot IMAP server. There appears to be many posts about similar problems, but none have the exact symptom I’m seeing.
Mail appears to not provide login information to any of my IMAP accounts. The iPad, iPhone, and Thunderbird on the same Mac all work with the same credentials. Just Apple Mail on the Mac fails. It fails for all user accounts on the same Mac. This has been a problem for a long time.
Connection doctor seems to indicate Mail is not sending login information. In fact, connection doctor shows the only thing working is the smtp server that doesn’t require a login. Everything else fails.
I’ve rebooted the Mac and the mail server.
I’ve repaired disk permissions.
I’ve recreated the account.
I’ve create a brand new account.
I’ve removed cache files.
I’ve re-indexed mail files.
Nothing works.
Here is the relevant connection doctor log:
INITIATING CONNECTION Jul 24 19:59:13.847 host:**********.*****.*** -- port:993 -- socket:0x0 -- thread:0x608000868640
CONNECTED Jul 24 19:59:13.939 [kCFStreamSocketSecurityLevelTLSv1_0] -- host:**********.*****.*** -- port:993 -- socket:0x6000002d97c0 -- thread:0x608000868640
READ Jul 24 19:59:13.939 [kCFStreamSocketSecurityLevelTLSv1_0] -- host:**********.*****.*** -- port:993 -- socket:0x6000002d97c0 -- thread:0x608000868640
* OK Dovecot ready.
WROTE Jul 24 19:59:13.939 [kCFStreamSocketSecurityLevelTLSv1_0] -- host:**********.*****.*** -- port:993 -- socket:0x6000002d97c0 -- thread:0x6080002687c0
1.20 CAPABILITY
READ Jul 24 19:59:13.940 [kCFStreamSocketSecurityLevelTLSv1_0] -- host:**********.*****.*** -- port:993 -- socket:0x6000002d97c0 -- thread:0x6080002687c0
* CAPABILITY IMAP4rev1 SASL-IR SORT THREAD=REFERENCES MULTIAPPEND UNSELECT LITERAL+ IDLE CHILDREN NAMESPACE LOGIN-REFERRALS UIDPLUS LIST-EXTENDED I18NLEVEL=1 AUTH=PLAIN
1.20 OK Capability completed.
WROTE Jul 24 19:59:13.944 [kCFStreamSocketSecurityLevelTLSv1_0] -- host:**********.*****.*** -- port:993 -- socket:0x6000002d97c0 -- thread:0x60800046e080
2.20 AUTHENTICATE PLAIN
And the relevant Dovecot log entries:
dovecot: Jul 24 19:59:13 Info: auth(default): client in: AUTH 1 PLAIN service=imap secured lip=***.***.***.*** rip=***.***.***.*** lport=993 rport=60869
dovecot: Jul 24 19:59:13 Info: auth(default): client out: CONT 1
dovecot: Jul 24 19:59:13 Info: imap-login: Disconnected (auth failed, 1 attempts): method=PLAIN, rip=***.***.***.***, lip=***.***.***.***, TLS
I believe the “WROTE” log line in Mail cooresponds to the “client in” line in Dovecot. The next line is a continuation going back to Mail. But, Mail never seems to read or process it. When Dovecot gets a successful login from Thunderbird, the login credentials were displayed in the log with another “client in” line.
Here is what I am using:
OS X 10.9.4
Mail version Version 7.3 (1878.6)
Dovecot version 1.1.7
Where do I go from here? Has anyone seen this symptom before? How do I get Mail to send credentials to an IMAP server?
Thanks from a first time poster !

Try MD5 as the authentication method.

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