Why DKIM_INVALID?

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Date: Sun, 22 Sep 2019 15:19:32 +0000
From: Twitter <info@twitter.com>
To: Jari Fredriksson <jarif@iki.fi>
Subject: =?UTF-8?Q?Ohjelmisto-_ja_e-business_ry_jakoi_?=
 =?UTF-8?Q?"Kristina_H=C3=A4rk=C3=B6nen_ohjelmoi_lapse...?=
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X-FredSpamComment: SpamAssassin called at jarif.iki.fi

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@jarif1, katso mit=C3=A4 maailmalla tapahtuu