Update 10-ssl.conf

dovecot/conf.d/10-ssl.conf

@@ -48,7 +48,7 @@ ssl_key = </etc/pki/dovecot/private/dovecot.pem
 #ssl_dh_parameters_length = 1024
 
 # SSL protocols to use
-ssl_protocols = TLSv1.2 TLSv1.1 TLSv1.3 TLSv1 !SSLv3 !SSLv2
+ssl_protocols = TLSv1.2 TLSv1.1 TLSv1 !SSLv3 !SSLv2
 
 # SSL ciphers to use
 ssl_cipher_list = ALL:!LOW:!SSLv2:!EXP:!aNULL