Additional hosts that send mail for your domains

You're referring to additional mail servers that can send emails on behalf of your domains!

In the context of email hosting, an additional host that sends mail for your domains is commonly known as a "mail relay" or "mail forwarder". This is a server that is configured to forward emails from your domain to the final destination, usually an email service provider or a mail server.

Here are some common scenarios where you might need additional hosts that send mail for your domains:

  1. Load balancing: You have multiple mail servers to distribute the email traffic and ensure high availability.
  2. Backup and redundancy: You have a secondary mail server that can take over in case the primary mail server goes down.
  3. Outsourced email services: You use a third-party email service provider, and they require you to configure additional mail servers to send emails on behalf of your domains.
  4. Domain-specific mail servers: You have multiple domains, and each domain has its own mail server or mail relay.

When configuring additional hosts that send mail for your domains, you'll need to consider the following:

  1. Authentication: Ensure that the additional hosts are properly authenticated to send emails on behalf of your domains.
  2. SPF (Sender Policy Framework): Update your SPF records to include the IP addresses of the additional hosts.
  3. DKIM (DomainKeys Identified Mail): Configure DKIM signatures on the additional hosts to ensure email authentication.
  4. Mail routing: Configure the mail routing to ensure that emails are properly routed to the final destination.

Some popular email services that offer additional hosts that send mail for your domains include:

  1. Amazon SES (Simple Email Service)
  2. Sendgrid
  3. Mailgun
  4. SparkPost
  5. Google Cloud Postmaster

Remember to carefully configure and test your additional hosts to ensure seamless email delivery and to avoid any potential issues with email authentication and spam filtering.