aws/aws-sdk-php — pull request #212 by timwhitlock (2014-01-16 17:52:02+00:00)
Title: Added eu-west-1 SES region

Looks like EU (Ireland) was added as a SES region
http://docs.aws.amazon.com/ses/latest/DeveloperGuide/regions.html

Setting eu-west-1 throws an error unless added to service description.