Good afternoon Qian, thank you for your reply but unfortunaltey the articles you linked to are all for Microsoft 365 for business users and require changes to be made in Exchange online that M365 personal/family users cannot make.

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Microsoft Learn
learn.microsoft.com › en-us › defender-office-365 › email-authentication-dkim-configure
How to use DKIM for email in your custom domain - Microsoft Defender for Office 365 | Microsoft Learn
In the domain details flyout that opens, select the Sign messages for this domain with DKIM signatures toggle that's currently set to Disabled . Note the Last checked date value. A Client error dialog opens. The error contains the values to use in the two CNAME records that you create at the domain registrar for the domain. In this example, the custom domain is contoso.com and the initial domain for the Microsoft 365 organization is contoso.onmicrosoft.com.
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Microsoft Community
techcommunity.microsoft.com › microsoft community hub › communities › products › microsoft 365 › microsoft 365
DKIM on Microsoft 365 Personal (and Family) | Microsoft Community Hub
I have a Microsoft 365 Personal account (not Business) which I have set up with a personalised email address. An SPF DNS record was automatically set up by GoDaddy, but it did not set up a DKIM DNS record and outgoing email is not DKIM signed.
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Reddit
reddit.com › r/gsuitelegacymigration › ms365 family - dkim and dmarc
r/gsuitelegacymigration on Reddit: MS365 Family - DKIM and DMARC
April 29, 2022 -

Doing my homework on the MS365 Family option and I came across three statements in this thread:
https://www.reddit.com/r/gsuitelegacymigration/comments/u0j1mo/why_isnt_microsoft_365_family_the_obvious_choice/
...that MS does not support DKIM, and one of those goes on to say that MS doesn't support DMARC.

That would indeed be a big deal. I looked it up though and I don't get it but it appears both (plus SPF) are supported in MS365 generally:
https://docs.microsoft.com/en-us/microsoft-365/security/office-365-security/use-dkim-to-validate-outbound-email?view=o365-worldwide
https://docs.microsoft.com/en-us/microsoft-365/security/office-365-security/use-dmarc-to-validate-email?view=o365-worldwide
...and is it too much to hope that these docs also apply to the Family product?

I will say that it seems unfortunately cumbersome to actually set these up -- with Google I never even needed to learn that these technologies existed. I could expect to have to learn these details with a low cost provider but doing so with MS is a disappointment.

Experts, have I gone astray here?

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LazyAdmin
lazyadmin.nl › home › how to configure dkim for office 365
How to Configure DKIM for Office 365 — LazyAdmin
June 25, 2024 - Where SPF is required to send emails from Office 365, it’s recommended to configure DKIM (together with DMARC). If you are only using the .onmicrosoft.com domain, then DKIM is enabled by default, but when you have one or more custom domains in Microsoft 365, then you really should configure DKIM.
Find elsewhere
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Microsoft Learn
learn.microsoft.com › en-us › answers › questions › 4681479 › dkim-keys
DKIM Keys - Microsoft Q&A
This information will help us provide specific navigation steps. Are you a global administrator user and do you have access to Microsoft 365 Admin Center? DKIM can be created and enabled from the Microsoft 365 Security portal.
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Microsoft Community
techcommunity.microsoft.com › microsoft community hub › communities › products › microsoft 365 › microsoft 365
Office 365 Home DKIM Configuration | Microsoft Community Hub
Hi, I have an Office 365 home account and have configured a personalised email address using GoDaddy. I have configured SPF on the GoDaddy Domain that...
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MxToolbox
mxtoolbox.com › c › outboundemailsources
Office365-SPF & DKIM Setup
This domain will NOT pass SPF Alignment. ... Open a separate tab and log in to your DNS Hosting provider and select Add/Create. Copy the values provided by Microsoft (MX or TXT) and paste them into the new record
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Microsoft Learn
learn.microsoft.com › en-us › answers › questions › 4645793 › dkim-support-for-personalised-domains-on-microsoft
DKIM support for personalised domains on Microsoft 365 Personal & Family - Microsoft Q&A
Personalised domains on Microsoft 365 Personal & Family were discontinued for new users as of November 30, 2023, but there are still a lot of users using them. The lack of DKIM support is a problem, since there are increasing efforts to make ...
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GoDaddy
godaddy.com › help › enable-and-add-dkim-to-my-domain-for-microsoft-365-41748
Enable and add DKIM to my domain for Microsoft 365 | Microsoft 365 from GoDaddy - GoDaddy Help US
Sign in to the Microsoft 365 Defender Portal. Use your Microsoft 365 email address and password (your GoDaddy username and password won't work here). Under DomainKeys Identified Mail (DKIM), select your domain name.
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Reddit
reddit.com › r/gsuitelegacymigration › m365 family - own domain and lack of dkim/dmarc
r/gsuitelegacymigration on Reddit: M365 Family - own domain and lack of DKIM/DMARC
March 25, 2021 -

Hi,

Is there any practical downside that I should be aware of before switching from gsuite legacy to M365 Family if there will be no DKIM/DMARC support? Is spf only enough to always treat my mails as valid or should I expect occasional marking my mails as spam (by gmail or other vendor) or maybe something else?

https://answers.microsoft.com/en-us/outlook_com/forum/all/microsoft-365-family-with-custom-domain-dkim-and/3b739764-93ea-4558-8161-732f09d34992

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Folderly
help.folderly.com › en › articles › 5496508-how-to-use-dkim-for-email-validation-in-your-custom-domain-in-office-365
How to use DKIM for email validation in your custom domain in Office 365 | Go to Folderly
New-DkimSigningConfig -DomainName <domain> -Enabled $false Get-DkimSigningConfig -Identity <domain> | Format-List Selector1CNAME, Selector2CNAME · Note that if you have provisioned custom domains in addition to the initial domain in Microsoft 365, you must publish two CNAME records for each additional domain.
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PowerDMARC
support.powerdmarc.com › support › solutions › articles › 60000676376-dkim-setup-for-office365
DKIM Office 365 Complete Setup Guide - PowerDMARC : PowerDMARC
An Office 365 DKIM setup is an email authentication protocol that aids in your defense against spoofing, phishing, and BEC attacks. Microsoft recommends a DKIM record to sign your outbound emails digitally so that they don't get tampered with o...
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Microsoft Community
techcommunity.microsoft.com › microsoft community hub › communities › products › outlook › outlook
DKIM support for personalised email addresses on Microsoft 365 Personal & Family | Microsoft Community Hub
New mailboxes with personalised domains on Microsoft 365 Personal & Family were discontinued for new users as of November 30, 2023, but there are still a lot of users using them · The lack of DKIM support is a problem, since there are increasing efforts to make SPF & DKIM mandatory in order ...