https://mailscribe.com/blog/how-to-separate-transactional-and-promotional-sends-with-subdomains
How To Separate Transactional And Promotional Sends With Subdomains - Mailscribe
Separate transactional and promotional emails with subdomains; set up SPF/DKIM, align DMARC, warm up traffic, and protect sender reputation and inboxing.
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https://skookummonkey.com/set-up-wordpress-multisite-with-subdomains-ssl-dns/wordpress-multisite-with-subdomains-ssl-configuration/
WordPress Multisite with Subdomains SSL Configuration - Skookum Monkey Hosting and Design
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