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About Servercore email service

Servercore Mail Service is a service for securely sending email newsletters.

Records of operations with the email service are stored in audit logs.

How it works

The service works as an MTA (mail transfer agent) and forwards mail from your servers to external networks. Information is transmitted in a secure form via the TLS protocol; the service does not process email data or store it. SMTP (Simple Mail Transfer Protocol) is used for sending.

When connecting the service, an email resource is created for you, to which you add your domain. You can add no more than three domains to a resource. Domains of the same resource will use the same username and password to connect to the SMTP server, and will share common statistics.

After connecting the service, you send emails from your server to the service's mail host (SMTP relay). You can use any utility that supports sending via SMTP. At the mail host, the recipient list is verified: addresses that are on stop lists are excluded. After that, the email is sent to the remaining recipients.

When sending, technical headers for the service are added to emails:

  • Return-Path — contains the technical email address sender@servercore-smtp.com where delivery status messages are sent. If you need to specify your own email address in this field, submit a ticket;
  • DKIM-Signature — confirms that the email service has the right to send mailings on behalf of the domain and protects against ending up in spam.

Pay attention to possible errors in the SMTP dialogue.

Limitations

The service has the following limits for a mail resource:

  • no more than one resource per project;
  • no more than three domains per resource;
  • sending speed through a resource is 100 emails per five minutes, regardless of the number of domains in the resource.

If you need to create more than one email resource in a project, add more than three domains to a resource, or increase the sending rate, submit a ticket and describe the purpose of the mailings. We will consider the possibility of increasing the limits.

Only UTF-8 encoding is supported for emails.

There are no limits on the number of mailing recipients, email size, or number of attachments in the service.

We recommend:

  • limiting email size to 10 MB or less. Recipient mail services may reject emails with larger sizes as suspicious;
  • specify no more than five recipients in a single email. If at least one of the recipients is on the stop list, the email will not be sent to any of them.