Amazon SES enhanced email security by supporting Secure/Multipurpose Internet Mail Extensions (S/MIME) signing natively. This enables senders to cryptographically sign emails so recipients can verify authenticity and integrity, confirming the sender owns the address and the message was unaltered in transit. Previously, message signing required manual processes before sending via SES.
The new feature automates signing using certificates stored in AWS Certificate Manager, simplifying deployment for security-conscious email senders. It maintains compatibility with clients lacking S/MIME support, which receive normal readable messages. This capability is available in all AWS regions where SES operates, providing a straightforward way to add digital signature assurance.
Source & further reading
Amazon SES now supports S/MIME email signing ↗Source published 2026-09-03. This report was prepared with AI assistance from the linked primary-source material. Claims and limitations should be checked against the original announcement or research.