Mimecast is apparently sending from 185.58.84.0/24 (specifically eu-smtp-delivery-42.mimecast.com / 185.58.84.42). This is not included in what customers apparently have in their SPF records ("include:eu._netblocks.mimecast.com" and "include:us._netblocks.mimecast.com“), with the obvious result.
— Matthias -- Matthias Leisi Katzenrütistrasse 68, 8153 Rümlang Mobile +41 79 377 04 43 matth...@leisi.net Skype matthias.leisi
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