SASL PLAIN authentication failedの表示が消したい時の対策について（メモ）

以下ログの表示されている、SASL PLAIN authentication failedの表示が消したい時の対策について

====== /var/log/mailling ==============

warning: unknown[192.168.1.201]: SASL PLAIN authentication failed:

================================


◻️赤字を追記して、アクセス制限を行う。
(アクセス可能なネットワーク範囲を指定する。)

vi /etc/dovecot/conf.d/auth-system.conf.ext
===========/etc/dovecot/conf.d/auth-system.conf.ext=========

# Authentication for system users. Included from 10-auth.conf.

#

# <doc/wiki/PasswordDatabase.txt>

# <doc/wiki/UserDatabase.txt>

# PAM authentication. Preferred nowadays by most systems.

# PAM is typically used with either userdb passwd or userdb static.

# REMEMBER: You'll need /etc/pam.d/dovecot file created for PAM

# authentication to actually work. <doc/wiki/PasswordDatabase.PAM.txt>

passdb {

  driver = pam

  # [session=yes] [setcred=yes] [failure_show_msg=yes] [max_requests=<n>]

  # [cache_key=<key>] [<service name>]

  #args = dovecot

  override_fields = allow_nets=127.0.0.0/8,::1/128,fe80::/64,192.168.1.0/24

}

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             以下、省略

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