Email Deliverability Benchmarks: Live Inbox & Auth Data

Quoted on this wiki

Every place a page here uses this source, in the order the words come in it.

1. >60 chars 8% “Short, clear subjects and proper unsubscribe links are strongly correlated with better inbox placement.” Methodology and citation

   In Inbox placement and spam filters

2. Excellent “Global deliverability remains challenging in 2026. Improved SPF/DKIM/BIMI adoption helps, but increased spam filtering and stricter ISP policies have tightened inbox placement.” Sender Authentication & Infrastructure

   In Email deliverability benchmarks

3. 91% good “Strong adoption continues with 9% still lacking basic SPF records.” DKIM Adoption

   In Email deliverability benchmarks

Quotes are verbatim and belong to their publishers. Where a quote has been translated, the original wording is kept below it.