- Unable to send email from the mailbox of the
exmaple.comdomain hosted in Plesk to Gmail with the error:
said: 550-5.7.26 This message does not pass authentication checks (SPF and
DKIM both 550-5.7.26 do not pass).
Reason: 550-5.7.26 This mail is unauthenticated, which poses a security risk to the 550-5.7.26 sender and Gmail users, and has been blocked. The sender must 550-5.7.26 authenticate with at least one of SPF or DKIM. For this message, 550-5.7.26 DKIM checks did not pass and SPF check for [example.com] 550-5.7.26 did not pass with ip: [184.108.40.206]. The sender should visit 550-5.7.26 https://support.google.com/mail/answer/81126#authentication for 550 5.7.26 instructions on setting up authentication.
- The DNS zone of the
exmaple.comdomain is hosted externally
SPF and DKIM records are missing or incorrect for the
exmaple.com domain on the DNS Registrar side.
On the DNS Registrar configure the same DKIM and SPF records for
example.com domain that can be found in Plesk > Domains > example.com > Hosting & DNS > DNS Settings page.