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/Mail delivery rate.

Very often it happens that the letters from the site do not go to the users. In this article, we'll show you how to diagnose, fix, and prevent these problems.

Spam lists

The reason for getting into spam can be the presence of your domain or server IP address in spam lists. Check whether it is possible in the services:

DNS records

To prevent spam, a large number of email services require special records on your DNS servers. Remember that after adding a record, the update process can take from 4 hours to 24 hours.

SPF record

The SPF record tells mail services which servers can send emails. Here are some popular situations of such records:

Emails can be sent only from the server of your site:

TXT @ “v=spf1 a -all”

Emails can be sent only from the server of your website and Gmail (if you have mail there):

TXT @ “v=spf1 a -all”

Check the record for correctness here:

DKIM record

DKIM record tells mail services the public encryption key by which you encode your emails. First, you need to generate public and private RSA keys.

To add a DKIM record with the «default» selector, you need to add such a record:

TXT “v=DKIM1; p=<open_rsa_key>”

Instead of <open_rsa_key> you need to add a public RSA key.

Don't forget to enable the DKIM encryption using the private key on your email client or in your website's message parsing code. You can check the correct setting via this service:

DMARC record

The DMARC record shows you where to send reports of attempts to spoof your mailbox.

The DMARC record format is as follows:

TXT "v=DMARC1; p=none;;; fo=1"

If someone tries to send a letter on your behalf, the message will come to the box

Check the record for correctness here:

Test email deliverability

You can check email deliverability via that service

News posting

Sending news is a very sensitive task. It is better to use the services of third-party services for mailing, but if you decide to do it yourself, make sure that:

Boxes list to test

In order not to lose users, test the deliverability of letters in such popular boxes as:


Active development of spam mailing makes spam filters stricter and stricter. So that problems with the deliverability of letters bypassed you, keep track of the reputation of your domain, and mass newsletters trust professional services.

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