Notes and Constraints
Caution
When you use SMN to send emails or messages, ensure that the content complies with local laws and regulations.
SMN pushes messages asynchronously, which does not ensure the timeliness of message delivery. If your service requires messages need to be delivered in a quasi-real-time manner, exercise caution whether to use SMN.
The email addresses and phone numbers used by SMN to send emails, SMS messages, or voice calls can be changed. Do not whitelist such email addresses or phone numbers. Otherwise, SMN messages may fail to be received if they are changed.
The source IP address used by SMN to send messages is not fixed and may be changed at any time. Do not configure a whitelist for source IP addresses, or you may fail to receive SMN messages.
Parent topic: Overview