Email Encryption — google-transparency-report-analysis.oriz.in

Data source: Google Transparency Report — Email Encryption.

Gmail-to-Gmail traffic has been 100% TLS encrypted since 2015.
Inbound encrypted traffic rose from ~55% (2014) to over 95% (2023).
Outbound encrypted rose similarly — from ~60% to over 95%.
Domains without TLS support are now a small minority of email senders.
Top domains with poor encryption tend to be legacy corporate and government mail servers.

Percentage of Gmail messages encrypted in transit, split by direction.