What is the problem of sending a letter from the Bitrix website?

Question

1C-Bitrix

Good afternoon, there is a site on Bitrix, when placing an order, it does not want to send an email to the mail specified in the admin panel. The hoster checked and wrote the following ....
We tried to send an email to our test box. We observe the following information -
This message was created automatically by mail delivery software.
A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:
host gmail-smtp-in.l.google.com [108.177.119.26]
SMTP error from remote mail server after pipelined end of data:
550-5.7.1 This message does not have authentication information or fails to pass
550-5.7.1 authentication checks. To best protect our users from spam, the
550-5.7.1 message has been blocked. Please visit
550-5.7.1 https://support.google.com/mail/answer/81126#authe... for more
550 5.7.1 information. i2si2864465ede.33 - gsmtp
Reporting-MTA: dns; fitopark.ru
Action: failed
Final-Recipient: rfc822;
Status: 5.0.0
Remote-MTA: dns; gmail-smtp-in.l.google.com
Diagnostic-Code: smtp; 550-5.7.1 This message does not have authentication information or fails to pass
550-5.7.1 authentication checks. To best protect our users from spam, the
550-5.7.1 message has been blocked. Please visit
550-5.7.1 https://support.google.com/mail/answer/81126#authe... for more
550 5.7.1 information. i2si2864465ede.33 - gsmtp
Sending is happening but for some reason neither gmail nor mail.ru want and can not accept letters sent from the site
Tell me what this may be connected with. The mail itself is working and is tied to biz.mail.ru along with the domain, incoming and outgoing from the mail everything works ...

Answer 1

spf record set up, the bottom line is that the IP address of your server is not in the sender lists, and therefore your letters are rejected by the above mentioned mail services.
https://help.mail.ru/biz/domain/verification_setti...