SPF (Sender Policy Framework) is a protection against address spoofing in email sending that, through domain name records (DNS), identifies authorized SMTP mail servers.
In practice, SPF blocks all emails it detects where the sending mail server does not have SPF enabled or configured correctly.
Recently, Google has tightened SPF restrictions. This means that many emails sent to @gmail.com accounts or certain SPF configurations may block emails.
If you have Google MX records configured or cdmon email configured in the Gmail application, you must modify the SPF record created in your panel.
To do this, access the DNS management of the domain you want to modify:
You must look for the SPF record among the TXT type records, just below the MX records. The default SPF record for cdmon is v=spf1 include:_spf.srv.cat ~all
You must edit the record:
Next, you must replace the SPF text with the following: