How to test email deliverability (placement tests + seed lists)
Don't guess — test. Use a seed list of inboxes across providers to see where your mail lands (inbox vs spam vs promotions), check your auth, and monitor reputation. Here's the testing routine.
Short answer: test email deliverability with a seed list — a set of inboxes across Gmail, Outlook, Yahoo and others that you send to and check where your mail lands (inbox / spam / promotions). Combine that with an auth check (SPF/DKIM/DMARC passing) and reputation monitoring (Google Postmaster Tools). Testing tells you the truth that open rates can't.
The testing routine
- Placement test — send to a seed list; record inbox vs spam vs promo per provider.
- Auth check — confirm SPF, DKIM, DMARC all pass on the sending domain.
- Content check — run the copy through a spam checker.
- Reputation — watch Postmaster Tools for complaints + domain reputation.
- Re-test after changes — warmup, new domain, new template.
Why test before scaling
Sending 10,000 emails to find out you're in spam is expensive. A 50-inbox seed test tells you first.
Autocloz includes placement monitoring + auth checks so you test continuously, not once.
> Start free — test placement before you scale the send.