Drupal applications need to send emails for several purposes such as password resets, user registrations, or other notifications. To meet these purposes, Acquia China Managed Service provides a primitive SMTP service.
Since Acquia China Managed Service is build based on AWS EC2 instances, Amazon Web Services’ EC2 instances are throttled on port 25 by default as a spam prevention measure. Therefore, you must create a Support ticket and request the Support team to enable the SMTP mail service.
Acquia recommends you to use a third-party email service for advanced email service, such as email marketing or bulk user notifications.
To enable the email service on Acquia China Managed Service:
Create a Support ticket and mention the Support team domain that you want to use for the email service.
After receiving a DNS SPF record from the Support team, update these config for your domain.
Create the following subdomain based on the SPF domain:
Add the following SPF entry to your original domain TXT record:
v=spf1 include:_spf.example.com -all
Add the following SPF entry to your new created SPF domain:
v=spf1 ip4:10.0.0.1 ip4:10.0.0.2 -all