Fix gmail authentification

Job ID: 37133118

Budget: $10 – $30 USD

https://support.google.com/mail/answer/81126#authentication

My company mail is being blocked by gmail. The solution is described above.

Please fix and guide me to what i need to do.

Small project - $10.
I need this sorting now - please

Also see mail failure message below:

host gmail-smtp-in.l.google.com [108.177.126.27]
SMTP error from remote mail server after pipelined end of data:
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 [ilo***rs.co.uk] did
550-5.7.26 not pass with ip: [185.56.87.1]. 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.
Related categories: PHP DNS Email Handling