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TLS Outbound

published by SendGrid2014

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EMAIL SECURITY
securing connections
At SendGrid, email security is at the core of our business. Recent revelations about dragnet nation state surveillance have raised awareness about email security to new levels.   With that in mind we are ensuring that ALL email sent via SendGrid will utilize opportunistic encryption using TLS.
8M
3.4M
70%
CN Mismatch
22%
9%
76% ISPs Support TLS 
96% of failures occur due to
65%
Self Signed
Expired
global domains
unique mail servers 
secure connections   
Those 8 million domains presented 3.4 million unique mail exchangers, 2,614,380 (76.1%) of which claimed to support TLS. We attempted to connect to all of them, and failed to successfully negotiate a trusted TLS connection with 223,800 of them (8.5%)