How do I set an SMTP password?
How many sender addresses can I add?
How many sender addresses can I delete?
Set an SMTP password
In the DirectMail console, go to Email Settings > Sender Addresses in the left-side navigation pane and click Create Sender Address. After creating a sender address, click Set SMTP Password in the Actions column to set the password.
Setting an SMTP password for your sender address enables SMTP sending.
You must set an SMTP password for a new sender address to use SMTP sending.

Sender address addition limit
You can add up to 100 sender addresses. For the most current information, see limits.
Sender address deletion limit
Sender address deletion limits vary by Alibaba Cloud user type:
Individual user: You can delete up to 10 sender addresses per month.
Enterprise user: You can delete up to 10 sender addresses per month.