Email from sendgrid are going to spam, spf & dkim pass & spamfilter itself says it isn’t spam

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At my work we use Sendgrid to send automatic e-mails to the users of our platform. Since a couple of days the e-mails are going to spam on hotmail.com & outlook.com. This is weird because the DNS settings (DKIM & SPF) are correct & the e-mail headers also give me no sign why it should be marked as spam.

Even the spamfilter itself says it isn't spam

Below I've put several of the headers:

  • Authentication-Results
    • spf=pass (sender IP is 208.117.55.132) smtp.mailfrom=platformmail.secretview.nl; hotmail.com; dkim=pass (signature was verified) header.d=secretview.nl;hotmail.com; dmarc=bestguesspass action=none header.from=secretview.nl;
  • DKIM-Signature
    • v=1; a=rsa-sha1; c=relaxed/relaxed; d=secretview.nl; h=content-type:from:mime-version:to:subject; s=s1; bh=G9ItZEcyujTsrHF9IzImCn29pmw=; b=XUwb1SnsU65OlJRtQKQpuJqrkqEIw 9OfiHwo2lioUwy1YLSQqPGFx3c4STtvV4s6H2VOuE86wqWOLo34j1xo9QNjvFatl F5xELtRl13sqnWdScPMaU9EKqi/1zDxHlVxq1RpulfgVCjqhi6PWYGPkW354fgRq NShjYMcFSspwjA=
  • X-Forefront-Antispam-Report
    • EFV:NLI;SFV:NSPM;SFS:(98901004);DIR:INB;SFP:;SCL:1;SRVR:SN1NAM01HT089;H:o1.f.az.sendgrid.net;FPR:;SPF:None;LANG:;
  • X-Microsoft-Antispam
  • BCL:3;PCL:0;RULEID:(5000109)(4604075)(4605076)(610169)(650170)(651021)(8291501071);SRVR:SN1NAM01HT089;
  • X-MS-Exchange-Organization-PCL
    • 2
  • X-Exchange-Antispam-Report-Test
    • UriScan:(269995582827781)(86561027422486)(231433314529491)(194151415913766)(64217206974132);
  • X-Exchange-Antispam-Report-CFA-Test
    • BCL:3;PCL:0;RULEID:(444111536)(1540499029)(595095)(82015058);SRVR:SN1NAM01HT089;BCL:3;PCL:0;RULEID:(100000803101)(100110400095);SRVR:SN1NAM01HT089;
  • X-MS-Exchange-Organization-SCL
    • 1

If you want any other headers, just ask

Best Answer

Sendgrid has clients that send a lot of advertising that is perceived as unsolicited by the final user. For every user that reports an email as spam the reputation of the sender goes down and all of the people using the service is affected. Reputation is usually attached to the ip classes that deliver the emails and to the domains. Domains of the relays, of the dkim signatures, of the envelope and header senders, of the links inside emails.

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