remove obsolete text

## SSL settings

##

# SSL/TLS upport: yes, no, required. <doc/wiki/SSL.txt>

# SSL/TLS support: yes, no, required. <https://doc.dovecot.org/latest/core/config/ssl.html>

ssl = required

# PEM encoded X.509 SSL/TLS certificate and private key. They're opened before

# dropping root privileges, so keep the key file unreadable by anyone but

# root. Included doc/mkcert.sh can be used to easily generate self-signed

# certificate, just make sure to update the domains in dovecot-openssl.cnf

# PEM encoded X.509 SSL/TLS certificate and private key.  By default, Debian

# installs a self-signed certificate.  This is useful for testing, but you

# should obtain a real certificate from a recognized certificate authority.

#

# These files are opened before dropping root privileges, so keep the key file

# unreadable by anyone but root. Included /usr/share/dovecot/mkcert.sh can be

# used to easily generate self-signed certificate, just make sure to update the

# domains in dovecot-openssl.cnf

# 

# Preferred permissions: root:root 0444

ssl_server_cert_file = /etc/letsencrypt/archive/yourdomain.com/cert.pem

# Preferred permissions: root:root 0400

ssl_server_key_file = /etc/letsencrypt/archive/yourdomain.com/privkey.pem

# If key file is password protected, give the password here. Alternatively

# give it when starting dovecot with -p parameter. Since this file is often

# world-readable, you may want to place this setting instead to a different

# root owned 0600 file by using ssl_key_password = <path.

#ssl_key_password =

#ssl_server_key_password =

# PEM encoded trusted certificate authority. Set this only if you intend to use

# ssl_verify_client_cert=yes. The file should contain the CA certificate(s)

# followed by the matching CRL(s). (e.g. ssl_ca = </etc/ssl/certs/ca.pem)

#ssl_ca = 

# ssl_request_client_cert=yes. The file should contain the CA certificate(s)

# followed by the matching CRL(s). (e.g. ssl_server_ca_file = /etc/ssl/certs/ca.pem)

#ssl_server_ca_file = 

# Require that CRL check succeeds for client certificates.

#ssl_require_crl = yes

#ssl_server_require_crl = yes

# Directory and/or file for trusted SSL CA certificates. These are used only

# when Dovecot needs to act as an SSL client (e.g. imapc backend or

# Request client to send a certificate. If you also want to require it, set

# auth_ssl_require_client_cert=yes in auth section.

#ssl_verify_client_cert = no

#ssl_server_request_client_cert = no

# Which field from certificate to use for username. commonName and

# x500UniqueIdentifier are the usual choices. You'll also need to set

# auth_ssl_username_from_cert=yes.

#ssl_cert_username_field = commonName

#ssl_server_cert_username_field = commonName

# SSL DH parameters

# Generate new params with `openssl dhparam -out /etc/dovecot/dh.pem 4096`

# Or migrate from old ssl-parameters.dat file with the command dovecot

# gives on startup when ssl_dh is unset.

ssl_server_dh_file = /usr/share/dovecot/dh.pem

# Minimum SSL protocol version to use. Potentially recognized values are SSLv3,

# TLSv1, TLSv1.1, TLSv1.2 and TLSv1.3, depending on the OpenSSL version used.

#

# Dovecot also recognizes values ANY and LATEST. ANY matches with any protocol

# version, and LATEST matches with the latest version supported by library.

# SSL protocols to use.  Debian systems specify TLSv1.2 by default, which should

# be reasonbly secure and compatible with existing clients.

# ssl_min_protocol = TLSv1.2

# Diffie-Hellman parameters are no longer required and should be phased out.

# They do not work with ECDH(E) and require DH(E) ciphers.

ssl_server_dh_file = /usr/share/dovecot/dh.pem

# SSL ciphers to use, the default is:

# SSL ciphers to use

ssl_cipher_list = ECDH+AESGCM256:DH+AESGCM256:ECDH+AES256:DH+AES256:!aNULL:!MD5:!DSS:!eNULL:!ADH:!EXP:!LOW:!PSK:!SRP:!RC4

# To disable non-EC DH, use:

#ssl_cipher_list = ALL:!DH:!kRSA:!SRP:!kDHd:!DSS:!aNULL:!eNULL:!EXPORT:!DES:!3DES:!MD5:!PSK:!RC4:!ADH:!LOW@STRENGTH

# Colon separated list of elliptic curves to use. Empty value (the default)

# means use the defaults from the SSL library. P-521:P-384:P-256 would be an

# example of a valid value.

#ssl_curve_list =

# Prefer the server's order of ciphers over client's.

#ssl_prefer_server_ciphers = yes

# SSL crypto device to use, for valid values run "openssl engine"

#ssl_crypto_device =

# SSL extra options. Currently supported options are:

#   compression - Enable compression.

#   no_ticket - Disable SSL session tickets.

#ssl_options =

#ssl_crypto_device = /dev/crypto