I have some additional information: The error messages in detail.
The Icedove error message when StartTLS is selected is:
The IMAP server <accountname> does not support the selected
authentication method.
Please change the 'Authentication method' in the 'Account Settings |
Server Settings'.
With SSL/TLS (port 993) selected, it times out.
The IMAP server (Courier-IMAPD) error message is (from syslog):
Mar 21 06:44:37 ant imapd-ssl: couriertls: accept: error:14094412:SSL
routines:SSL3_READ_BYTES:sslv3 alert bad certificate
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Met vriendelijke groeten/With kind regards, Erik Laan.
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