The DMARC ‘fo’ tag options and their ideal use cases
There are some optional tags in DMARC, and ‘fo’ is one of them. It stands for ‘failure options.’ The ‘fo’ tag allows domain owners to specify the conditions under which forensic (RUF) reports should be generated for SPF and/or DKIM authentication checks. There are four possible values for this tag: fo=0, fo=1, fo=d, and fo=s….