Mail delivery failed: returning message to sender when sending email to google accounts

MacBook Air owner, Ventura 13.4.

Most of the time I send a mail to a google account, my email bounces:

Mail delivery failed: returning message to sender, in the bounce email I get this message:

'SMTP error from remote server for TEXT command, host: gmail-smtp-in.l.google.com(142.251.31.26) 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 [gmail.com] did not 

pass

550-5.7.26 with ip: [212.227.126.187]. The sender should visit

550-5.7.26 https://support.google.com/mail/answer/81126#authentication fo

r

550 5.7.26 instructions on setting up authentication. c13-20020aa7df0d0000

00b005149a7a743dsi5143352edy.105 - gsmtp'

Please help!