For generating new SPF records you can use this free tool      SPF-Generator What is an SPF Record? An SPF (Sender Policy Framework) record is used to indicate which hosts are authorised to send emails for a domain. It is defined in RFC 4408 and clarified...

DMARC stands for “Domain-based Message Authentication, Reporting & Conformance.”  DMARC is built upon two other authentication protocols: SPF (Sender Policy Framework) and DKIM (DomainKeys Identified Mail).  DMARC policy tells a receiving server how to handle an incoming email claiming to be coming from a particular...