Mail SMTP Configuration
Created#More Posted time:May 31, 2017 10:01 AM
I'm running an web application hosted on ECS (IIS v7) need to access mailserver to send out email. Any special configuration? Wondering if we have any documentation in english which will guide us thru the steps?
1st Reply#Posted time:Jun 12, 2017 18:16 PM
Alibaba Cloud disabled port 25 for going out.
If you want to build mail server on ECS, we don't support using port 25, but suggest you using smtp, port 465, SSL to set up mail server.
If you are using port 25 to connect to 3rd party mail service provider, please check with them if they can redirect the request from other port to port 25. If they can do that, then you can send request to their other port, and they redirect to port 25.
2nd Reply#Posted time:Jan 28, 2018 10:36 AM
SMTP on port 25 is unsecured and should be avoided when possible.
Alternative to port 25, use port 465 instead - typically used for SMTP with TLS encryption.
To use port 465 your application should be made to support SMTP TSL.
In the case you still want access to port 25, you can request for the port to be opened: