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.
At service connection A mail 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 login and password to connect to the SMTP server and will be collected in common statistics.
After connecting the service, you send e-mails from your server to the service's mail node (SMTP relay). For sending you can use any utility that supports sending via SMTP. At the mail node, the list of recipients is checked — addresses that are in the stop lists. The mail is then sent to the remaining addressees.
When sent, the service's technical headers are added to the emails:
Return-Path— contains technical mailsender@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
The service has limits for the mail resource:
- no more than one resource per project;
- no more than three domains in one resource;
- speed of sending through the resource — 400 mails in 5 minutes regardless of the number of domains in the resource.
If you need to create more than one mail resource in a project, add more than three domains to a resource, or increase your sending speed, file a ticket and describe the purpose of the mailings. We will consider increasing the limits.
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.