Protect your Email domain from spoofing
Email address spoofing is when the envelope sender address is forged to make it seem as though the email originated from a legitimate source. This technique is often used for spam and phishing. Reduce the likelihood of your domain name getting fraudulently spoofed and keep your messages from getting flagged as spam before they reach your recipients.
In order to secure your e-mail service and make sure that you won't have issues with e-mail spoofing, you need to set SPF records.
Adding an SPF record to your DNS zone file is the best way to stop spammers from spoofing your domain. In addition, an SPF Record will reduce the number of legitimate e-mail messages that are flagged as spam or bounced back by your recipients' mail servers. The SPF record is not 100% effective, unfortunately, because not all mail providers check for it.
DKIM and DMARC records can further secure your domain.