Recently I've received this email from AWS, should we do something with Sendy?
Dear Amazon SES customer,
To continue improving the security of our cloud platform, Amazon SES will migrate the SSL certificates for the HTTPs and SMTP interfaces to use a new certificate chain signed using the SHA256 algorithm. The update will start on September 22, 2015 at 1a.m. PDT and will impact the US-EAST-1, EU-WEST-1, and US-WEST-2 Regions. This update is part of a wider AWS initiative for which you can find more details in this AWS security bulletin: http://aws.amazon.com/security/security-bulletins/aws-to-switch-to-sha256-hash-algorithm-for-ssl-certificates/.