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If an administrator requests `smtp_security=starttls`, but SMTP server disables STARTTLS, then EPN downgrade security to `none`, which means plain text. Administrator doesn't expect such behavior. Fixes: https://pagure.io/freeipa/issue/8578 Signed-off-by: Stanislav Levin <slev@altlinux.org> Reviewed-By: Rob Crittenden <rcritten@redhat.com> Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com>