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Message ID	<479798586.1664704732.1599178606107.JavaMail.mktmail@xxxx.org>
Created at:	Fri, Sep 4, 2020 at 9:16 AM (Delivered after 1 second)
From:	Figma <community@xxx.com>
To:	mike@xxx.co.jp
Subject:	You will not be graded on this
SPF:	PASS with IP 192.28.158.138 Learn more
DKIM:	'PASS' with domain figma.com Learn more
DMARC:	'PASS' Learn more

送信の仕組み

REFERENCES:

  • https://sendgrid.kke.co.jp/blog/?p=12290
  • https://salt.iajapan.org/wpmu/anti_spam/universal/measure/another-address/
  • https://xtech.nikkei.com/it/article/COLUMN/20070706/276898/