SMTP service endpoints for each region.
|
Region |
Endpoint |
|
China (Hangzhou) |
smtpdm.aliyun.com |
|
Singapore |
smtpdm-ap-southeast-1.aliyuncs.com |
|
US (Virginia) |
smtpdm-us-east-1.aliyuncs.com |
|
Germany (Frankfurt) |
smtpdm-eu-central-1.aliyuncs.com |
SMTP port numbers: 25, 80, and 465 (for SSL encryption).
-
Port 25 is disabled by default on Alibaba Cloud ECS and Web Hosting instances. Use port 80 (non-SSL) or port 465 (SSL) instead.
-
You can also use STARTTLS to enable explicit SSL/TLS on port 25 or 80.
Select the endpoint that matches your console region.
To send from other regions such as China (Hong Kong), How to select a sending region.
Legacy endpoints (not recommended for new users):
-
Singapore: smtpdm-ap-southeast-1.aliyun.com
-
Australia (Sydney): smtpdm-ap-southeast-2.aliyun.com
If you encounter connectivity issues, run these commands and capture the output:
1. Get the IP address: ping smtpdm.aliyun.com
2. Test port connectivity: telnet smtpdm.aliyun.com 80
3. Check for route packet loss: mtr -n -i 1 -c 100 smtpdm.aliyun.com
4. Capture packets (use a non-encrypted port such as 80 or 25 while reproducing the issue): tcpdump -i any -n host smtpdm.aliyun.com and port 80 -w package.pcap
Replace the endpoint and port with your actual values.