Here's the truth about your email open rate: 40-60% of the time, your 'low open rate' is actually a high spam rate. The emails aren't being ignored. They're being filtered before anyone sees them.
What Gmail changed in 2024
In February 2024, Gmail and Yahoo both rolled out new sender requirements that effectively kill emails from senders who don't have proper authentication. This wasn't a gradual change — it was a cliff. Senders who didn't comply saw inbox rates drop from 80% to 20% overnight.
Most small businesses still haven't fixed this. They see their open rates drop, blame their copy, rewrite their subject lines, and wonder why nothing works. The actual problem is infrastructural.
The 6 things that matter
SPF record (mandatory since 2024)
Tells receiving servers which IPs are allowed to send from your domain. Missing or broken SPF = automatic spam classification on Gmail.
DKIM signature (mandatory since 2024)
Cryptographically signs your emails to prove they came from your domain. Requires DNS setup per sending service (Google, Mailchimp, Klaviyo, etc).
DMARC policy (mandatory for bulk senders since 2024)
Tells receivers what to do with emails that fail SPF or DKIM. Requires a policy of at minimum 'p=none' for bulk senders. Most small businesses have nothing configured.
Sending domain warmup (for new domains)
Any new domain needs 2-4 weeks of gradual volume ramp before full sending. Jumping to 500 emails/day from a cold domain = spam folder guaranteed.
Engagement-based reputation
Gmail tracks opens, replies, and marks-as-important to build a reputation score for your domain. High engagement = better inboxing. Low engagement = slow decay into spam.
List hygiene
Dead addresses, role accounts (info@, sales@), and previously bounced addresses all tank your reputation. Clean your list monthly or use a validation service.
The deliverability test you should run today
Before you spend another dollar on email marketing, run this free 5-minute test:
- Go to mail-tester.com and get a test email address
- Send an email from your normal sending setup to that address
- Wait 30 seconds for the score
- A score of 9-10/10 means your deliverability setup is solid. 8 or below means something's broken.
We've never audited a business with sub-7/10 that wasn't silently losing money to deliverability. It's the single cheapest win in email marketing.
“Before you rewrite your subject lines, fix your SPF. One of these moves the needle 10x more than the other.”
What to do if you're already in spam
Once a domain's reputation is tanked, you have two options. Option one: 6-12 weeks of careful rehabilitation — stop sending to unengaged contacts, reduce volume 80%, re-engage only known-active readers. Slow but recovers the domain. Option two: move to a fresh sending domain and do it right this time.
Most of our clients end up in option two. The opportunity cost of 6 weeks of rehab is usually higher than the 2 weeks it takes to set up a new domain portfolio properly.
The multi-domain strategy for serious senders
For cold outbound at scale, one domain isn't enough. We typically run clients on 3-12 sending domains (all variants of their main brand, e.g., brand.co, brand.io, getbrand.com) with volume rotated across them. If one gets flagged, the others keep running. Engagement rebuilds per domain. This is the professional setup.
FAQ
Stop losing emails to the spam folder.
We audit and fix email deliverability for SMBs, agencies, and B2B sales teams. Typical improvement: 2-3x effective open rates within 30 days. Free deliverability audit below.