With email in particular, it's not like chocolate. If you self-host email, or use any other cloud host besides Microsoft or Google, then Microsoft and Google will randomly fail to deliver emails you send to their users, even though you have SPF, DKIM, DMARC, etc. set up exactly right.
With email in particular, it's not like chocolate. If you self-host email, or use any other cloud host besides Microsoft or Google, then Microsoft and Google will randomly fail to deliver emails you send to their users, even though you have SPF, DKIM, DMARC, etc. set up exactly right.