IMAP on Exchange server SSL issue

I am trying to setup IMAP access to my Exchange server 2016.

Followed these instructions

And I see this

[PS] C:\Windows\system32>Get-ImapSettings | Format-List *ConnectionSettings,*Bindings,X509CertificateName

InternalConnectionSettings : {ex-sx-01.domain.local:993:SSL, ex-sx-01.domain.local:143:TLS}
ExternalConnectionSettings : {,}
UnencryptedOrTLSBindings   : {[::]:143,}
SSLBindings                : {[::]:993,}
X509CertificateName        :

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Which seems to be ok

However if I try to connect I get

MBP13:~ alex$ telnet 993
Connected to
Escape character is '^]'.
* BYE Connection is closed. 14
Connection closed by foreign host.
MBP13:~ alex$ 

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MBP13:~ alex$ openssl s_client -connect -crlf
140736108229576:error:140770FC:SSL routines:SSL23_GET_SERVER_HELLO:unknown protocol:/BuildRoot/Library/Caches/
no peer certificate available
No client certificate CA names sent
SSL handshake has read 7 bytes and written 318 bytes
New, (NONE), Cipher is (NONE)
Secure Renegotiation IS NOT supported
Compression: NONE
Expansion: NONE
No ALPN negotiated
MBP13:~ alex$ 

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It would seem that my SSL setup is not correct ?!

Any suggestion / pointer ?
Alexandre TakacsCTOAsked:
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Jose Gabriel Ortega CEE Solution Guide - CEO Faru Bonon ITCommented:
The problem is that a wildcard certificate can't be assigned to use IMAP.

Is IMAP Service enabled?

My suggestion Do not use IMAP or POP anymore you have an exchange server use, Outlook Anywhere or ActiveSync.


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Alexandre TakacsCTOAuthor Commented:
The problem is that a wildcard certificate can't be assigned to use IMAP.

Aha - good catch ! Thanks
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