Fix DMARC reporting format parser.

The DMARC "rf" (reporting format) tag was not parsed correctly.  The
token name and equals sign was not stripped before breaking the value
down into a colon-separated list.  This quick fix corrects it.

Thanks to Chris for making me scan a domain of his, which showed me
this bug in action.

CHANGELOG.md

@@ -1,5 +1,8 @@
 # MailPolicyExplainer Change Log
 
+## Version 1.3.1 (Wednesday, December 9, 2023)
+- **FIX** The DMARC `rf` token is now parsed correctly.
+
 ## Version 1.3.0 (Tuesday, November 7, 2023)
 - **NEW** `Test-SpfRecord` can now recursively evaluate SPF records to count how many DNS lookups are performed when evaluating `redirect=` modifiers and `include:` tokens.  Use either `Test-SpfRecord -CountDnsLookups`, `Test-SpfRecord -Recurse`, or `Test-MailPolicy -CountSpfDnsLookups` to use this new mode.  Note that this overrides the new behavior introduced in version 1.2.0.
 - **FIX** Fixed grammar in some `Test-SpfRecord` messages.

MailPolicyExplainer.psd1

@@ -12,7 +12,7 @@
 RootModule = 'src/MailPolicyExplainer.psm1'
 
 # Version number of this module.
-ModuleVersion = '1.3.0'
+ModuleVersion = '1.3.1'
 
 # Supported PSEditions
 CompatiblePSEditions = @('Core', 'Desktop')
@@ -167,9 +167,7 @@ PrivateData = @{
 		IconUri = 'https://raw.githubusercontent.com/rhymeswithmogul/MailPolicyExplainer/main/icon/PSGallery.png'
 
 		# ReleaseNotes of this module
-		ReleaseNotes = '- Test-SpfRecord can now recursively evaluate SPF records to count how many DNS lookups are performed when evaluating `redirect=` modifiers and `include:` tokens.  Use either `Test-SpfRecord -CountDnsLookups`, `Test-SpfRecord -Recurse`, or `Test-MailPolicy -CountSpfDnsLookups` to use this new mode.
-- Fixed grammar in some `Test-SpfRecord` messages.
-- RFC documents were supposed to be made available as conceptual help, but were not.  This has been corrected.'
+		ReleaseNotes = '- The DMARC "rf" token is now parsed correctly.'
 
 	} # End of PSData hashtable
 

src/MailPolicyExplainer.psm1

@@ -538,14 +538,14 @@ Function Test-DmarcRecord
 			}
 		}
 		ElseIf ($token -Like 'rf=*') {
-			$formats = $token -Split ':'
+			$formats = $token.Substring(3) -Split ':'
 			ForEach ($format in $formats) {
 				$format = $format.Trim()
 				If ($format -eq 'afrf') {
 					Write-Informational 'DMARC: Failure reports can be sent in AFRF format (default).'
 				}
 				Else {
-					Write-BadNews "DMARC: Failure reports can be sent in the unknown $format format.  Mail receivers may ignore the entire DMARC record."
+					Write-BadNews "DMARC: The reporting format $format is not an allowed format.  Mail receivers may ignore the entire DMARC record."
 				}
 			}
 		}