The questions we get asked most.

What is BIMI, and do I need a VMC?

What is DKIM, and how does DKIM signing work?

What is DMARC alignment, and why do SPF and DKIM pass but DMARC fail?

What is DMARC?

What is email deliverability, and how is it different from delivery rate?

What is engagement-based filtering, and how do mailbox providers use it?

What is Google Postmaster Tools, and what do its dashboards mean?

What is greylisting, and why did my email arrive late?

What is one-click unsubscribe, and how do I implement List-Unsubscribe?