Amazon SES (Simple Email Service) & Amazon WorkMail
Amazon SES (Simple Email Service) is mainly used for sending emails via websites. SES is a highly scalable service for sending and receiving emails but does not provide a storage facility. It is upstream of WorkMail's inbox and delivers incoming emails to WorkMail accounts accordingly.
Amazon WorkMail offers the operation of mail services with mailboxes and calendars including the storage of emails of up to 50 gigabytes per mailbox.