How to set up SPF, DKIM, and DMARC?

Let's figure out what needs to be done to prevent emails from going to spam.
SPF, DKIM, and DMARC are the basic settings that you must make before starting email marketing, no matter which mailing service you choose. Without them, the letter will not be delivered to the client's mailbox or will end up in the "Spam" folder.
SPF and DKIM are DNS records, without which the message will most likely not be delivered or will end up in the "Spam" folder.
The Domain Name System (DNS) is the Internet system for mapping literal names to numeric Internet Protocol (IP) addresses. For example, when a web address (URL) is entered into a browser, a DNS query is made to find out the IP address of the webserver associated with that name.
DMARC is an algorithm of actions with your mailings if messages are found suspicious. All of these security elements are created as TXT, a DNS record type that allows textual information to be associated with a domain.
SPF confirms that the domain is not fake.
Sender Policy Framework is an entry with a list of servers and IP addresses from which it is allowed to send messages on behalf of the domain. By setting up SPF, you inform the mail services that it was you who sent the letter. If the letter is sent from an IP or server that is not in the record, the provider will regard it as spam.
To set up SPF, create a text record of the servers from which you send mailings. Settings are made in the domain hosting control panel.
DKIM improves the sender's reputation.
DKIM (DomainKeys Identified Mail) is an email verification technology that can be used to identify fake emails. DKIM adds a digital signature to the letter. Thanks to it, mail providers can verify that the message was sent from the specified domain.
DKIM works like this: the letter contains encrypted data about who sent the letter and when. The postal provider receives this data along with the letter. The provider decrypts them using the public key posted on the domain from which the letter was sent. The public key is placed in the DNS record in the TXT field.
If the data match, it means that this is an honest sender, the letter can be passed to the "Inbox". If not - a fraudster, the letter is sent to "Spam".
DMARC specifies the verification algorithm.
Domain-based Message Authentication, Reporting & Conformance (DMARC) is an email sender authentication policy based on DKIM and SPF protocols. This policy determines how the recipient's mail server should process incoming messages if the sender's address could not be identified.
You define the algorithm yourself. There are three options:
- nothing to do;
- mark as spam;
- reject.
For DMARC to work, you first need to configure SPF and DKIM signatures on letters. Upon receipt of a message, the postal provider checks the SPF and DKIM for correctness and compliance with the domain. If the check fails, then your domain's DMARC policy takes effect. After verification, reports are sent to you.
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Thanks for your instruction