Email Deliverability in 2026

Deliverability is getting harder. Google and Microsoft have tightened filters. AI spam detection is more sophisticated. What worked in 2022 doesn't reliably work now.

What Still Works

Personalization. Emails that reference specific details about the recipient get marked as spam less often. Not because filters can read context — but because personalized emails generate replies and engagement, which trains filters that you're legit.

Clean lists. Bounce rate above 2% kills your reputation fast. Verify every email before sending. Suplex does this automatically — SMTP verification before any address enters a campaign.

Proper authentication. SPF, DKIM, DMARC — non-negotiable in 2026. If you haven't set these up on your sending domain, do it today.

What Doesn't Work Anymore

• High-volume blasting from a single account
• Same template to thousands of people
• Heavy HTML emails with multiple images and links
• Bought lists from sketchy sources

The Deliverability Stack

Dedicated sending domain + proper DNS auth + verified leads + personalized content + 40-50/day per account = good deliverability. Suplex handles verification and personalization. The domain and DNS are your job.

Try Suplex

Local desktop app. Verified leads. AI-written emails. 40-50/day per account, safely. trysuplex.com