Setup Valid SPF DKIM
From: https://kb.smtp.com/article/2367-instructions-on-how-to-set-up-a -valid-spf-and-dkim





Instructions on how to set up a valid 
SPF and DKIM
As part of our ongoing effort to keep you informed about upcoming changes from
Google and Yahoo!, we want to bring your attention to a critical update. 
Starting in February, both Google and Yahoo will mandate email senders to verify
their identities through authentication protocols such as SPF and DKIM.
SPF (Sender Policy Framework) authenticates the sender, allowing only
authorized servers to send emails from your domain. Meanwhile, DKIM
(DomainKeys Identified Mail) verifies that a message remains unchanged during 
transit. By implementing these protocols, you enhance your email domain's 
security against spoofing attacks and fraud while also improving email 
deliverability.



Key Changes:
  1. SPF Record:
    • Record Type: TXT
    • Content/Value: v=spf1 include:_spf.smtp.com ~all
  2. DKIM Record:
    • Record Type: CNAME
    • Host Name: smtpkey._domainkey.yourdomain.com
    • Content/Value: smtpcustomer._domainkey.smtpsend.com
    Note: If you are using GoDaddy, the DKIM record should be set up as follows:
    • Record Type: CNAME
    • Host Name: smtpmail._domainkey.(your domain is assumed)
    • Content/Value: smtpcustomer._domainkey.smtpsend.com

Action Steps:
Important Notes: Once you have made these changes, please contact support@smtp.com. Our Team will ensure that your settings are mirrored to finalize the setup. Explore our additional instructions on SPF, DKIM, and Email Authentication (SPF, DKIM, DMARC)