Common issues related to the Sender Policy Framework (SPF)
The main issue with SPF is that it must be configured for your domain, otherwise the Exchange Online Protection (EOP) will treat the email as spam or junk.
Resolution:
You have to correctly configure the SPF record in the required DNS provider or in the domain registrar.
Steps to add SPF record in Sigsync
What is TTL and why is it required?
TTL stands for time to live, and it specifies how frequently the domain name server caches any changes to the SPF record. When configuring the SPF records for your domain name server (DNS), you normally have to specify the TTL value. Plan and enter the TTL value during SPF configuration because the shorter the TTL value, the greater the load on the name server. Enter the TTL time, to change the SPF record based on the requirements. The TTL value is specified in seconds.
If you have configured more than one SPF record for a domain then verify all the SPF records and ensure that you have created a single SPF record that includes all the records before deleting the others from the domain. Instead of creating new SPF records, try to add additional information to update the existing SPF record.
Validate your SPF record
If your email ends up in the Spam or Junk folder, check to see if your SPF record is properly configured in the environment. Validate the SPF record using third-party tools available in the market such as kitterman.com.
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