SMTP service address

China (Hangzhou): smtpdm.aliyun.com

Singapore (New): smtpdm-ap-southeast-1.aliyuncs.com

USA (New): smtpdm-us-east-1.aliyuncs.com

Germany: smtpdm-eu-central-1.aliyuncs.com

SMTP port number: 25,80,465 (SSL encryption)

Note: ECS (Elastic Compute Service) has disabled port 25 for security reasons. If your sender is deployed on an Elastic Compute Service (ECS) instance, we recommend that you use port 80 if you do not select SSL. If you select SSL, use port 465. Ditto for Cloud Web Hosting server. In addition, we support enabling the explicit SSL/TLS feature on port 25 or 80 with the smtp command "STARTTLS".

Select the corresponding server address based on the service region selected in the console.

For more information about how to send letters to other regions such as China (Hong Kong), see How do I select the region where letters are sent from?