Marketing
Audit email deliverability
DNS, authentication and reputation, with what is actually blocking inbox placement.
Fill it in
Which one.
SPF, DKIM, DMARC and the alignment between them.
Not every placement problem is authentication.
Your prompt
Audit deliverability for [your sending domain]. Run the DNS checks: SPF, DKIM and DMARC, and whether they ALIGN. Alignment is where most of these fail: a valid SPF that authorises a different domain than the From header passes the check and fails DMARC, and the reports nobody reads say so. Check the SPF lookup count. Over ten and the whole record silently fails, which happens the moment somebody adds a fourth sending tool. Check whether DMARC is on p=none, which means it is reporting and enforcing nothing, and whether anyone receives the reports. Check the content too: a link shortener, an image-only email, a mismatched return-path or a brand-new sending domain will land in spam with perfect authentication.
Use Audit email deliverabilityOpens with everything above already filled in.
Why this works
Most placement problems are alignment: a valid SPF that authorises a different domain than the From header passes its own check and fails DMARC. This checks the whole chain.