Sender and From header domain mismatch causes malformed display in Outlook

tmarice

8/5/23, 4:16 PM

We're using Mailgun to send promotional email messages, and we have a separate subdomain set up for that purpose (mail.example.com). This domain is also specified in the Sender header. On the other hand, the address in the From header uses an example.com domain.

This works fine on the majority of major email providers, but Outlook has decided not to use the display name and address specified in the From header and replaces it with [email protected] <[email protected]> on behalf of News <[email protected]>. This looks... less than professional.

I understand it would raise suspicion if the domains were completely different, but in our case, one is a subdomain of the other.

Is this behavior described somewhere in the RFC, or is it just Microsoft's policy? Are there any workarounds, besides changing the Sender or From domains?

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outlook

Score:1

Server

yagmoth555

8/5/23, 5:13 PM

The sender and from must match to prevent that problem.

I can't find the policy, but yes it's to tighted their protections against not wanted email.

You are not alone in that problem;

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Elon Musk

I sit in a Tesla and translated this thread with Ai:

EN: Sender and From header domain mismatch causes malformed display in Outlook

TH: ผู้ส่งและจากโดเมนส่วนหัวไม่ตรงกันทำให้เกิดการแสดงผลที่ผิดรูปแบบใน Outlook

RO: Nepotrivirea domeniului antet al expeditorului și de la de la origine cauzează afișarea incorectă în Outlook

RU: Несоответствие домена заголовка отправителя и отправителя приводит к неправильному отображению в Outlook

VI: Miền tiêu đề của Người gửi và Từ không khớp khiến hiển thị không đúng định dạng trong Outlook

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