На AWS заработали IMAP и SMTP

Доступно во всех регионах
aws.amazon.com/about-aws/global-infrastructure/regional-product-services/

Лимиты
docs.aws.amazon.com/general/latest/gr/aws_service_limits.html#limits_workmail

Полезности
docs.aws.amazon.com/workmail/latest/userguide/using_IMAP_client.html
И адреса SMTP
docs.aws.amazon.com/general/latest/gr/rande.html#wm_region

aws.amazon.com/workmail/

aws.amazon.com/ru/about-aws/whats-new/2017/05/amazon-workmail-now-offers-an-smtp-gateway-for-sending-email/