I found a problem during testing. Version postfix 3.9.0. When using
dovecot sasl for verification, if dovecot dies or the network connecting to
dovecot fails, smtpd will not be able to return 220. Mail cannot be received. I
used net socket to connect to dovecot. Is it possible to judge the connection
status of dovecot? If dovecot is unavailable, sasl is considered disabled until
dovecot sasl returns to normal. This should not affect other mail services. It
will not cause security risks. You can also set a timeout for dovecot sasl. Or
there are other better methods. In short, smtpd cannot be stopped from working.
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