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Platform Email Service Guide


For additional information about Platform Email Service, see its product documentation.

Last updated: November 1, 2021

Acquia provides a robust transactional email sending solution. To use Platform Email Service, customers must update the authoritative DNS configuration. Acquia manages the service, however, the service leverages the AWS SES infrastructure. Platform Email Service does not support the multi-region capability for sending emails, and all emails are sent from the us-east-1 region. For all Acquia Cloud customers who utilize Platform Email Service, the following Fair Use policy applies:

  • Email sending rate: The maximum email sending rate with Platform Email is limited to 200 emails per second per AWS accounts. Acquia customers are equally distributed across three AWS accounts. This limit is increased to 500 email per second with AWS support and this is a hard limit. Emails beyond this limit are dropped, and are subject to loss as Platform Email does not have a queuing mechanism at client side at the moment.
  • Email sending domains: The number of domains a customer can configure is determined at the subscription level. The number of domains are subject to increase.
  • Maximum recipient in one email: Platform Email supports a maximum of 50 unique recipients including to, cc, and bcc fields in an email. Any email sent to email DL (alias) is counted as one.
  • Maximum message size: Platform Email supports a maximum email size upto 10 MB per message.
  • Email attachment: Platform Email service does not support email attachments.
  • Spam and Bounce: Customers are automatically blocked when emails continually bounce or a spam is detected. After the customers are blocked, any sent email is lost and cannot be recovered.
  • Use verified domain only for sending email: Customers are responsible for using a verified domain only for sending email in Drupal or in their cron jobs. If their email sending domain is not verified or not attached to their application, emails are not sent.