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Aug 11 01:34:06 guard postfix/smtp[27313]: 8F113C856: to=<********@ea.mbn.or.jp>,relay=mx.mbn.or.jp[220.111.47.194]:25, delay=4460, delays=4458/0.05/1.8/0, dsn=4.0.0, status=deferred (hostmx.mbn.or.jp[220.111.47.194] refused to talk to me: 421 Too many sessions)
smtp_destination_recipient_limit が1セッションの最大宛先数
smtp_destination_concurrency_limit が同じ接続先に対する同時接続数
/usr/local/etc/postfix/main.cf.default
default_destination_concurrency_limit = 20 default_destination_recipient_limit = 50 elay_destination_concurrency_limit = $default_destination_concurrency_limit smtp_destination_concurrency_limit = $default_destination_concurrency_limit virtual_destination_concurrency_limit = $default_destination_concurrency_limit
/usr/local/etc/postfix/main.cf
smtp_destination_concurrency_limit = 1
