troubleshooting Question

DKIM Setup

Avatar of Jason Crawford
Jason CrawfordFlag for United States of America asked on
ExchangeMicrosoft 365
4 Comments1 Solution26 ViewsLast Modified:
I have setup DKIM for my custom domain in Exchange Online and it shows pass when sending a test email and inspecting the headers:

ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass
 smtp.mailfrom=mydomain.net; dmarc=pass action=none
 header.from=mydomain.net; dkim=pass header.d=mydomain.net; arc=none
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
 d=mydomain.onmicrosoft.com; s=selector2-mydomain-onmicrosoft-com;
 h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck;
 bh=DelGf+gWPEhOvltwPFOouDoJUz05MJ7aNGn/c7H8Dro=;
 b=FF7o+GdJEn3iwuwslLI+FzxA8zlUPoVwwvRHIEbQpIrmOc5tPOtAjKYR6E8OD1ZEqJ7aj7q2Qpw4DZPFm8i5iTg/WLwv9vWBTW/2Z8haVXJ9OuJLCdZ91pLscP36byQPzDJ4QPIoWQlCRqrjwyawoBiz0c5YWAmOp321GU0LLh8=

My question is this, I have an application sending email as mydomain.net using IIS SMTP and I have accounted for this IP in my SPF record so it looks something like this:

v=spf1 ip4:1.2.3.4 include:spf.protection.outlook.com -all

If email is sent from 1.2.3.4 for mydomain.net will it still pass DKIM?  How do I account for that IP in my DKIM setup?
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