dovecot: Error: Failed to initialize SSL server context

Problem s přihlášením do pop3 a imapu po upgradu na debian 10

Error v logu:

dovecot: imap-login: Error: Failed to initialize SSL server context: Can't load DH parameters: error:1408518A:SSL routines:ssl3_ctx_ctrl:dh key too small: user=<>

/etc/dovecot/conf.d/10-ssl.conf

přidat:

ssl_dh = </usr/share/dovecot/dh.pem

curl https://ssl-config.mozilla.org/ffdhe4096.txt > /usr/share/dovecot/dh.pem

a restart dovecot

# service dovecot restart