SendGrid

Shopify App Store: customize your online store and grow your business with Shopify-approved apps for marketing, store design, fulfillment, and more.

企业微信，是腾讯微信团队为企业打造的专业办公管理工具。与微信一致的沟通体验，丰富免费的OA应用，并与微信消息、小程序、微信支付等互通，助力企业高效办公和管理。全面安全保障，国际权威认证，银行级别加密水平，保障企业数据安全。

Outlook – free personal email and calendar from Microsoft

网易163免费邮箱，你的专业电子邮局，注册用户数超10亿，专业稳定安全。网易邮箱官方App“邮箱大师”帮您高效处理邮件，支持所有邮箱，并可在手机、Windows和Mac上多端协同使用。

Grow your business on your terms with Mailchimp's All-In-One marketing, automation & email marketing platform. Easy to use - start for free!

Get results with email marketing. Gain loyal customers and manage customer journeys with our best-in-class email campaign software.