[mcsniff]

Sorry, but this isn't brand new stuff.

As a small business owner, you should have had DMARC, SPF, and DKIM set up already to ensure your mail gets delivered properly.

[danpalmer]

This stuff was all “table stakes” when I ran my own email server about 8 years ago. It might not have been enforced 100% of the time, but absolutely impacts deliverability for senders of all sizes.

[b20000]

i have SPF and DKIM and i already have enough work