Google & Yahoo Email Deliverability Changes - February 2024

[superp]

Hello! 

I'm sure most of you are aware. Google and Yahoo are both adding requirements for successful email deliverability very soon in February 2024. 

These four main changes are:

-Required DKIM, SPF, and DMARC records

-Branded Sending Domain

-One-Click unsubscribe link

-Keep spam complaints under 0.3% (literally 3 complaints every thousand emails.....)

Lots of questions here:

-Has the 1024 vs 2048 DKIM debacle been solved yet? Currently, I believe Shopify will only accept 1024 bit DKIM records which is a huge problem as February 2024 is coming very soon.
-If Shopify is hosting our domain, we update/add our DKIM, SPF, and DMARC records right in the back of Shopify, correct? (admin profile > settings > domains > add record)

-If we're using a third-party email service (e.g. Klaviyo) and we update create our branded sending domain in the third-party service, does this affect Shopify transactional emails? (Order confirmations, receipts, etc)  Do we need to do something else in the Shopify backend to create a branded sending domain? Would this just entail adding DKIM, SPF, and DMARC records for our sending domain in the back end of shopify???

Thank you for your time!