I figured it out. I needed the following in the passdb sql stanza:
default_password_scheme = SHA512-CRYPT.
So, problem solved! The entire working dovecot.conf config is as follows:
# *** REQUIRED *** Dovecot config and storage versions
dovecot_config_version = 2.4.2
dovecot_storage_version = 2.4.2
passdb sql {
default_password_scheme = SHA512-CRYPT
query = SELECT crypt as password FROM users WHERE username = '%{user}' AND
(type = 'local' OR type = 'piped');
}
userdb sql {
query = SELECT pop as home, uid, gid FROM users WHERE username = '%{user}';
}
sql_driver = mysql
mysql /var/run/mysqld/mysqld.sock {
user = exim4u
password = SECRET
dbname = exim4u
}
protocols {
imap = yes
pop3 = yes
}
protocol imap {
mail_max_userip_connections = 50
}
protocol pop3 {
pop3_uidl_format = %{uid}%{uidvalidity}
}
service auth {
user = dovecot
}
ssl = required
ssl_server_cert_file = /etc/pki/tls/exim_tls/exim.cert
ssl_server_key_file = /etc/pki/tls/exim_tls/exim.key
ssl_server_dh_file = /etc/dovecot/dh.pem
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
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