Check SPF record of your domain!
What is SPF?
The Sender Policy Framework (SPF) is an email authentication protocol that protects domains from spoofing attacks and other cybersecurity threats.
SPF introduces additional security checks that enable a mail server to determine whether a message truly originated from a specific domain, or if the domain name is being used by a malicious hacker pretending to be an authentic user.
An SPF record, also known as the SPF TXT record, is a DNS record similar to a DMARC record that is part of a domain’s DNS. It has a list of all the IP addresses that are allowed to send emails on the domain’s behalf.
Here’s an example of an SPF record:
v=spf1 a mx ip4:69.64.153.131 include:_spf.emailclient.com ~all
