So I'm using Active Campaign as a CRM and have configured DKIM, SPF, and a DMARC none policy. I am having one particular customer of mine that's not able to receive my emails despite them whitelisting me. They are using mimecast. I've done a ton of research at this point and feel I've exhausted the options for what I can do to improve deliverability from a DNS perspective. I am even implementing BIMI as a last resort. Is there any way to designate to email providers that it's safe for From Envelopes to mismatch From Headers as long as the From Envelope is a passed SPF domain (s11.avl3.acemsrvc.com in the example below).
My domain is tortoiseandharesoftware.com
<policy_published> <domain>tortoiseandharesoftware.com</domain> <adkim>r</adkim> <aspf>r</aspf> <p>none</p> <sp>none</sp> <pct>100</pct> </policy_published> <record> <row> <source_ip>22.214.171.124</source_ip> <!-- Active Campaign IP--> <count>2</count> <policy_evaluated> <disposition>none</disposition> <dkim>pass</dkim> <spf>fail</spf> </policy_evaluated> </row> <identifiers> <header_from>tortoiseandharesoftware.com</header_from> </identifiers> <auth_results> <dkim> <domain>tortoiseandharesoftware.com</domain> <selector>dk</selector> <result>pass</result> <human_result/> </dkim> <spf> <domain>s11.avl3.acemsrvc.com</domain> <!-- Active Campaign sending domain and also the from envelope domain email is routed through PostMark see: https://help.activecampaign.com/hc/en-us/articles/206903370-SPF-DKIM-and-DMARC-Authentication --> <result>pass</result> </spf> </auth_results> </record>