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General information about Selectel mail service
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General information about Selectel mail service

Selectel Mail Service is a service for securely sending domain mailings from your servers in Selectel to external networks. You can send mail through the service only from servers in the Selectel infrastructure.

Principle of operation⁠

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

After service connections you send mail from your server in the Selectel infrastructure to the service's mail host (SMTP relay). You can use any utility that supports SMTP relaying. At the mail node, the recipient list is checked to exclude addresses that are in the stop list. The mail is then sent to the remaining addressees.

When sent, the service's technical headers are appended to the emails:

  • Return-Path — contains technical mail sender@mail.selcloud.ruThis is where delivery status messages are sent. If you need to specify your own mail in this field, file a ticket;
  • DKIM-Signature — confirms that the mail service has the right to make mailings on behalf of the domain, protects it from getting into spam.

Pay attention to possible errors in the SMTP dialog.

Cost⁠

Sent mails, including unsuccessful mails, are paid for. The price per letter is set for each range: up to 1 million, up to 10 million, up to 100 million. When the number of letters sent in the current month exceeds the next range, the price for the next letters is reduced. The first 1000 letters are sent free of charge.

The following is used to pay for the service depending on the type of balance in the account single balance or cloud platform balance. The fee is deducted from the balance at the end of each hour according to the number of emails sent per hour.

Prices can be viewed at selectel.ru.

Limitations⁠

Only UTF-8 encoding is supported for emails.

The service has no restrictions on the number of newsletter recipients, email size or number of attachments.

We recommend:

  • limit the weight of an email to no more than 10 MB. Mail services of recipients may reject e-mails with heavy weight as suspicious;
  • specify no more than five recipients in a single letter. If at least one of the recipients is in the stop list the e-mail won't be sent to any of them.