When attempting a doveadm backup, e.g. :

doveadm -D backup -Ru user tcp:foo.example.com:12345

I am getting the following error :

Error: SSL handshake failed: SSL_accept() failed: error:0A00010B:SSL 
routines::wrong version number

There is nothing wrong with my SSL config because, e.g. openssl s_client 
-connect localhost:993 works on the source host.

So I don't know why doveadm doesn't work.

My SSL config is:
ssl = required
ssl_cert = </etc/ssl/foo.example.com.pem
ssl_key = </etc/ssl/foo.example.com.priv
ssl_client_ca_dir = /etc/ssl/certs 
ssl_min_protocol = TLSv1.2
ssl_prefer_server_ciphers = yes
ssl_cipher_list = 
ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384:DHE-RSA-CHACHA20-POLY1305
service doveadm {
  inet_listener {
    port = 12345
    ssl = yes
  }
}
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