Error executing "SendEmail" on "https://email.ap-northeast-1.amazonaws.com"; AWS HTTP error: Client error: `POST https://email.ap-northeast-1.amazonaws.com` resulted in a `400 Bad Request` response:
<ErrorResponse xmlns="http://ses.amazonaws.com/doc/2010-12-01/">
  <Error>
    <Type>Sender</Type>
    <Code>MessageReje (truncated...)
 MessageRejected (client): Email address is not verified. The following identities failed the check in region AP-NORTHEAST-1: kengo.kawabe@side-river.jp - <ErrorResponse xmlns="http://ses.amazonaws.com/doc/2010-12-01/">
  <Error>
    <Type>Sender</Type>
    <Code>MessageRejected</Code>
    <Message>Email address is not verified. The following identities failed the check in region AP-NORTHEAST-1: kengo.kawabe@side-river.jp</Message>
  </Error>
  <RequestId>9c28f6c5-2863-4750-97a1-641df60c2751</RequestId>
</ErrorResponse>
Failure:Email address is not verified. The following identities failed the check in region AP-NORTHEAST-1: kengo.kawabe@side-river.jp