General information about the Selectel mail service
Selectel Mail Service is a service for securely sending domain mailings from your Selectel servers to external networks. You can send mail through the service only from servers in the Selectel infrastructure.
Principle of operation
The service works like an MTA (mail transfer agent) — it forwards mail from your servers to external networks without storing data at home. SMTP — Simple Mail Transfer Protocol is used for sending.
After connecting the service, you send mail from your server to the service's mail node (SMTP relay). To send, you can use any utility that supports SMTP sending. The list of recipients is checked at the mail node — addresses that are in the [stop list] are excluded(/networks-services/selectel-email-service/smtp-errors.mdx#stop-list). After that, the mail is sent to the remaining recipients.
Pay attention to possible errors in the SMTP dialog.
Cost
Sent emails are paid, including unsuccessful mailings. 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 emails sent in the current month exceeds the next range, the price for the next emails decreases. The first 1000 emails are sent for free.
To pay for the service, depending on the type of balance in the account, [single balance] is used(/control-panel-actions/balance-and-payments/balance.mdx#united-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 ](https://selectel.ru/services/additional/smtp /).
Restrictions
The service has no restrictions on the number of mailing recipients, the size of the letter or the number of attachments.
We recommend:
- limit the weight of the message to no more than 10 MB. Recipients' mail services may reject emails with a high weight as suspicious;
- specify no more than five recipients in one letter. If at least one of the recipients is on the stop list, the email will not be sent to any of them.