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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