diff --git a/dmarcrpt/feedback.go b/dmarcrpt/feedback.go
index 5521405..c9bb285 100644
--- a/dmarcrpt/feedback.go
+++ b/dmarcrpt/feedback.go
@@ -107,6 +107,8 @@ type PolicyOverrideReason struct {
 type PolicyOverride string
 
 const (
+	PolicyOverrideAbsent PolicyOverride = ""
+
 	PolicyOverrideForwarded        PolicyOverride = "forwarded"
 	PolicyOverrideSampledOut       PolicyOverride = "sampled_out"
 	PolicyOverrideTrustedForwarder PolicyOverride = "trusted_forwarder"
diff --git a/go.mod b/go.mod
index d44cb56..eed91dd 100644
--- a/go.mod
+++ b/go.mod
@@ -10,7 +10,7 @@ require (
 	github.com/mjl-/sherpa v0.6.7
 	github.com/mjl-/sherpadoc v0.0.12
 	github.com/mjl-/sherpaprom v0.0.2
-	github.com/mjl-/sherpats v0.0.5
+	github.com/mjl-/sherpats v0.0.6
 	github.com/prometheus/client_golang v1.18.0
 	github.com/russross/blackfriday/v2 v2.1.0
 	go.etcd.io/bbolt v1.3.9
diff --git a/go.sum b/go.sum
index 59dbcff..ee2505c 100644
--- a/go.sum
+++ b/go.sum
@@ -39,8 +39,8 @@ github.com/mjl-/sherpadoc v0.0.12 h1:6hVe2Z0DnwjC0bfuOwfz8ov7JTCUU49cEaj7h22NiPk
 github.com/mjl-/sherpadoc v0.0.12/go.mod h1:vh5zcsk3j/Tvm725EY+unTZb3EZcZcpiEQzrODSa6+I=
 github.com/mjl-/sherpaprom v0.0.2 h1:1dlbkScsNafM5jURI44uiWrZMSwfZtcOFEEq7vx2C1Y=
 github.com/mjl-/sherpaprom v0.0.2/go.mod h1:cl5nMNOvqhzMiQJ2FzccQ9ReivjHXe53JhOVkPfSvw4=
-github.com/mjl-/sherpats v0.0.5 h1:XJBorAxUY/C8IBjCmu741353Ex7CFXrb53NDGCrBu74=
-github.com/mjl-/sherpats v0.0.5/go.mod h1:MoNZJtLmu8oCZ4Ocv5vZksENN4pp6/SJMlg9uTII4KA=
+github.com/mjl-/sherpats v0.0.6 h1:2lSoJbb+jkjLOdlvoMxItq0QQrrnkH+rnm3PMRfpbmA=
+github.com/mjl-/sherpats v0.0.6/go.mod h1:MoNZJtLmu8oCZ4Ocv5vZksENN4pp6/SJMlg9uTII4KA=
 github.com/mjl-/xfmt v0.0.2 h1:6dLgd6U3bmDJKtTxsaSYYyMaORoO4hKBAJo4XKkPRko=
 github.com/mjl-/xfmt v0.0.2/go.mod h1:DIEOLmETMQHHr4OgwPG7iC37rDiN9MaZIZxNm5hBtL8=
 github.com/mwitkow/go-conntrack v0.0.0-20161129095857-cc309e4a2223/go.mod h1:qRWi+5nqEBWmkhHvq77mSJWrCKwh8bxhgT7d/eI7P4U=
diff --git a/vendor/github.com/mjl-/sherpats/ts.go b/vendor/github.com/mjl-/sherpats/ts.go
index d1826de..929ecfe 100644
--- a/vendor/github.com/mjl-/sherpats/ts.go
+++ b/vendor/github.com/mjl-/sherpats/ts.go
@@ -218,7 +218,7 @@ class verifier {
 					return v
 				}
 			}
-			error('unknkown value ' + v + ' for named strings ' + t.Name)
+			error('unknown value ' + v + ' for named strings ' + t.Name)
 		} else if (intsTypes[nt.Name]) {
 			const t = nt as Ints
 			if (typeof v !== 'number' || !Number.isInteger(v)) {
@@ -232,7 +232,7 @@ class verifier {
 					return v
 				}
 			}
-			error('unknkown value ' + v + ' for named ints ' + t.Name)
+			error('unknown value ' + v + ' for named ints ' + t.Name)
 		} else {
 			throw new Error('unexpected named type ' + nt)
 		}
diff --git a/vendor/modules.txt b/vendor/modules.txt
index 47d6724..c74595e 100644
--- a/vendor/modules.txt
+++ b/vendor/modules.txt
@@ -32,7 +32,7 @@ github.com/mjl-/sherpadoc/cmd/sherpadoc
 # github.com/mjl-/sherpaprom v0.0.2
 ## explicit; go 1.12
 github.com/mjl-/sherpaprom
-# github.com/mjl-/sherpats v0.0.5
+# github.com/mjl-/sherpats v0.0.6
 ## explicit; go 1.12
 github.com/mjl-/sherpats
 github.com/mjl-/sherpats/cmd/sherpats
diff --git a/webaccount/account.js b/webaccount/account.js
index 9e59b2e..c13e52a 100644
--- a/webaccount/account.js
+++ b/webaccount/account.js
@@ -514,7 +514,7 @@ var api;
 						return v;
 					}
 				}
-				error('unknkown value ' + v + ' for named strings ' + t.Name);
+				error('unknown value ' + v + ' for named strings ' + t.Name);
 			}
 			else if (api.intsTypes[nt.Name]) {
 				const t = nt;
@@ -529,7 +529,7 @@ var api;
 						return v;
 					}
 				}
-				error('unknkown value ' + v + ' for named ints ' + t.Name);
+				error('unknown value ' + v + ' for named ints ' + t.Name);
 			}
 			else {
 				throw new Error('unexpected named type ' + nt);
diff --git a/webaccount/api.ts b/webaccount/api.ts
index d25fafa..d9ab421 100644
--- a/webaccount/api.ts
+++ b/webaccount/api.ts
@@ -402,7 +402,7 @@ class verifier {
 					return v
 				}
 			}
-			error('unknkown value ' + v + ' for named strings ' + t.Name)
+			error('unknown value ' + v + ' for named strings ' + t.Name)
 		} else if (intsTypes[nt.Name]) {
 			const t = nt as Ints
 			if (typeof v !== 'number' || !Number.isInteger(v)) {
@@ -416,7 +416,7 @@ class verifier {
 					return v
 				}
 			}
-			error('unknkown value ' + v + ' for named ints ' + t.Name)
+			error('unknown value ' + v + ' for named ints ' + t.Name)
 		} else {
 			throw new Error('unexpected named type ' + nt)
 		}
diff --git a/webadmin/admin.js b/webadmin/admin.js
index 8173b6c..cff1d0d 100644
--- a/webadmin/admin.js
+++ b/webadmin/admin.js
@@ -299,6 +299,7 @@ var api;
 	// was not applied.
 	let PolicyOverride;
 	(function (PolicyOverride) {
+		PolicyOverride["PolicyOverrideAbsent"] = "";
 		PolicyOverride["PolicyOverrideForwarded"] = "forwarded";
 		PolicyOverride["PolicyOverrideSampledOut"] = "sampled_out";
 		PolicyOverride["PolicyOverrideTrustedForwarder"] = "trusted_forwarder";
@@ -420,7 +421,7 @@ var api;
 		"Alignment": { "Name": "Alignment", "Docs": "", "Values": [{ "Name": "AlignmentAbsent", "Value": "", "Docs": "" }, { "Name": "AlignmentRelaxed", "Value": "r", "Docs": "" }, { "Name": "AlignmentStrict", "Value": "s", "Docs": "" }] },
 		"Disposition": { "Name": "Disposition", "Docs": "", "Values": [{ "Name": "DispositionAbsent", "Value": "", "Docs": "" }, { "Name": "DispositionNone", "Value": "none", "Docs": "" }, { "Name": "DispositionQuarantine", "Value": "quarantine", "Docs": "" }, { "Name": "DispositionReject", "Value": "reject", "Docs": "" }] },
 		"DMARCResult": { "Name": "DMARCResult", "Docs": "", "Values": [{ "Name": "DMARCAbsent", "Value": "", "Docs": "" }, { "Name": "DMARCPass", "Value": "pass", "Docs": "" }, { "Name": "DMARCFail", "Value": "fail", "Docs": "" }] },
-		"PolicyOverride": { "Name": "PolicyOverride", "Docs": "", "Values": [{ "Name": "PolicyOverrideForwarded", "Value": "forwarded", "Docs": "" }, { "Name": "PolicyOverrideSampledOut", "Value": "sampled_out", "Docs": "" }, { "Name": "PolicyOverrideTrustedForwarder", "Value": "trusted_forwarder", "Docs": "" }, { "Name": "PolicyOverrideMailingList", "Value": "mailing_list", "Docs": "" }, { "Name": "PolicyOverrideLocalPolicy", "Value": "local_policy", "Docs": "" }, { "Name": "PolicyOverrideOther", "Value": "other", "Docs": "" }] },
+		"PolicyOverride": { "Name": "PolicyOverride", "Docs": "", "Values": [{ "Name": "PolicyOverrideAbsent", "Value": "", "Docs": "" }, { "Name": "PolicyOverrideForwarded", "Value": "forwarded", "Docs": "" }, { "Name": "PolicyOverrideSampledOut", "Value": "sampled_out", "Docs": "" }, { "Name": "PolicyOverrideTrustedForwarder", "Value": "trusted_forwarder", "Docs": "" }, { "Name": "PolicyOverrideMailingList", "Value": "mailing_list", "Docs": "" }, { "Name": "PolicyOverrideLocalPolicy", "Value": "local_policy", "Docs": "" }, { "Name": "PolicyOverrideOther", "Value": "other", "Docs": "" }] },
 		"DKIMResult": { "Name": "DKIMResult", "Docs": "", "Values": [{ "Name": "DKIMAbsent", "Value": "", "Docs": "" }, { "Name": "DKIMNone", "Value": "none", "Docs": "" }, { "Name": "DKIMPass", "Value": "pass", "Docs": "" }, { "Name": "DKIMFail", "Value": "fail", "Docs": "" }, { "Name": "DKIMPolicy", "Value": "policy", "Docs": "" }, { "Name": "DKIMNeutral", "Value": "neutral", "Docs": "" }, { "Name": "DKIMTemperror", "Value": "temperror", "Docs": "" }, { "Name": "DKIMPermerror", "Value": "permerror", "Docs": "" }] },
 		"SPFDomainScope": { "Name": "SPFDomainScope", "Docs": "", "Values": [{ "Name": "SPFDomainScopeAbsent", "Value": "", "Docs": "" }, { "Name": "SPFDomainScopeHelo", "Value": "helo", "Docs": "" }, { "Name": "SPFDomainScopeMailFrom", "Value": "mfrom", "Docs": "" }] },
 		"SPFResult": { "Name": "SPFResult", "Docs": "", "Values": [{ "Name": "SPFAbsent", "Value": "", "Docs": "" }, { "Name": "SPFNone", "Value": "none", "Docs": "" }, { "Name": "SPFNeutral", "Value": "neutral", "Docs": "" }, { "Name": "SPFPass", "Value": "pass", "Docs": "" }, { "Name": "SPFFail", "Value": "fail", "Docs": "" }, { "Name": "SPFSoftfail", "Value": "softfail", "Docs": "" }, { "Name": "SPFTemperror", "Value": "temperror", "Docs": "" }, { "Name": "SPFPermerror", "Value": "permerror", "Docs": "" }] },
@@ -1208,7 +1209,7 @@ var api;
 						return v;
 					}
 				}
-				error('unknkown value ' + v + ' for named strings ' + t.Name);
+				error('unknown value ' + v + ' for named strings ' + t.Name);
 			}
 			else if (api.intsTypes[nt.Name]) {
 				const t = nt;
@@ -1223,7 +1224,7 @@ var api;
 						return v;
 					}
 				}
-				error('unknkown value ' + v + ' for named ints ' + t.Name);
+				error('unknown value ' + v + ' for named ints ' + t.Name);
 			}
 			else {
 				throw new Error('unexpected named type ' + nt);
diff --git a/webadmin/admin.ts b/webadmin/admin.ts
index d895c9f..5aa0714 100644
--- a/webadmin/admin.ts
+++ b/webadmin/admin.ts
@@ -1246,7 +1246,7 @@ const renderDMARCSummaries = (summaries: api.DMARCSummary[]) => {
 						dom.td(style({textAlign: 'right'}), r.DispositionQuarantine === 0 && r.DispositionReject === 0 ? '0/0' : box(red, '' + r.DispositionQuarantine + '/' + r.DispositionReject)),
 						dom.td(style({textAlign: 'right'}), box(r.DKIMFail === 0 ? green : red, '' + r.DKIMFail)),
 						dom.td(style({textAlign: 'right'}), box(r.SPFFail === 0 ? green : red, '' + r.SPFFail)),
-						dom.td(!r.PolicyOverrides ? [] : Object.entries(r.PolicyOverrides).map(kv => kv[0] + ': ' + kv[1]).join('; ')),
+						dom.td(!r.PolicyOverrides ? [] : Object.entries(r.PolicyOverrides).map(kv => ((kv[0] || '(no reason)') + ': ' + kv[1]).join('; ')),
 					)
 				),
 			),
diff --git a/webadmin/api.json b/webadmin/api.json
index f31aa62..267bea0 100644
--- a/webadmin/api.json
+++ b/webadmin/api.json
@@ -4492,6 +4492,11 @@
 			"Name": "PolicyOverride",
 			"Docs": "PolicyOverride is a reason the requested DMARC policy from the DNS record\nwas not applied.",
 			"Values": [
+				{
+					"Name": "PolicyOverrideAbsent",
+					"Value": "",
+					"Docs": ""
+				},
 				{
 					"Name": "PolicyOverrideForwarded",
 					"Value": "forwarded",
diff --git a/webadmin/api.ts b/webadmin/api.ts
index 30589a9..9deecff 100644
--- a/webadmin/api.ts
+++ b/webadmin/api.ts
@@ -726,6 +726,7 @@ export enum DMARCResult {
 // PolicyOverride is a reason the requested DMARC policy from the DNS record
 // was not applied.
 export enum PolicyOverride {
+	PolicyOverrideAbsent = "",
 	PolicyOverrideForwarded = "forwarded",
 	PolicyOverrideSampledOut = "sampled_out",
 	PolicyOverrideTrustedForwarder = "trusted_forwarder",
@@ -865,7 +866,7 @@ export const types: TypenameMap = {
 	"Alignment": {"Name":"Alignment","Docs":"","Values":[{"Name":"AlignmentAbsent","Value":"","Docs":""},{"Name":"AlignmentRelaxed","Value":"r","Docs":""},{"Name":"AlignmentStrict","Value":"s","Docs":""}]},
 	"Disposition": {"Name":"Disposition","Docs":"","Values":[{"Name":"DispositionAbsent","Value":"","Docs":""},{"Name":"DispositionNone","Value":"none","Docs":""},{"Name":"DispositionQuarantine","Value":"quarantine","Docs":""},{"Name":"DispositionReject","Value":"reject","Docs":""}]},
 	"DMARCResult": {"Name":"DMARCResult","Docs":"","Values":[{"Name":"DMARCAbsent","Value":"","Docs":""},{"Name":"DMARCPass","Value":"pass","Docs":""},{"Name":"DMARCFail","Value":"fail","Docs":""}]},
-	"PolicyOverride": {"Name":"PolicyOverride","Docs":"","Values":[{"Name":"PolicyOverrideForwarded","Value":"forwarded","Docs":""},{"Name":"PolicyOverrideSampledOut","Value":"sampled_out","Docs":""},{"Name":"PolicyOverrideTrustedForwarder","Value":"trusted_forwarder","Docs":""},{"Name":"PolicyOverrideMailingList","Value":"mailing_list","Docs":""},{"Name":"PolicyOverrideLocalPolicy","Value":"local_policy","Docs":""},{"Name":"PolicyOverrideOther","Value":"other","Docs":""}]},
+	"PolicyOverride": {"Name":"PolicyOverride","Docs":"","Values":[{"Name":"PolicyOverrideAbsent","Value":"","Docs":""},{"Name":"PolicyOverrideForwarded","Value":"forwarded","Docs":""},{"Name":"PolicyOverrideSampledOut","Value":"sampled_out","Docs":""},{"Name":"PolicyOverrideTrustedForwarder","Value":"trusted_forwarder","Docs":""},{"Name":"PolicyOverrideMailingList","Value":"mailing_list","Docs":""},{"Name":"PolicyOverrideLocalPolicy","Value":"local_policy","Docs":""},{"Name":"PolicyOverrideOther","Value":"other","Docs":""}]},
 	"DKIMResult": {"Name":"DKIMResult","Docs":"","Values":[{"Name":"DKIMAbsent","Value":"","Docs":""},{"Name":"DKIMNone","Value":"none","Docs":""},{"Name":"DKIMPass","Value":"pass","Docs":""},{"Name":"DKIMFail","Value":"fail","Docs":""},{"Name":"DKIMPolicy","Value":"policy","Docs":""},{"Name":"DKIMNeutral","Value":"neutral","Docs":""},{"Name":"DKIMTemperror","Value":"temperror","Docs":""},{"Name":"DKIMPermerror","Value":"permerror","Docs":""}]},
 	"SPFDomainScope": {"Name":"SPFDomainScope","Docs":"","Values":[{"Name":"SPFDomainScopeAbsent","Value":"","Docs":""},{"Name":"SPFDomainScopeHelo","Value":"helo","Docs":""},{"Name":"SPFDomainScopeMailFrom","Value":"mfrom","Docs":""}]},
 	"SPFResult": {"Name":"SPFResult","Docs":"","Values":[{"Name":"SPFAbsent","Value":"","Docs":""},{"Name":"SPFNone","Value":"none","Docs":""},{"Name":"SPFNeutral","Value":"neutral","Docs":""},{"Name":"SPFPass","Value":"pass","Docs":""},{"Name":"SPFFail","Value":"fail","Docs":""},{"Name":"SPFSoftfail","Value":"softfail","Docs":""},{"Name":"SPFTemperror","Value":"temperror","Docs":""},{"Name":"SPFPermerror","Value":"permerror","Docs":""}]},
@@ -1782,7 +1783,7 @@ class verifier {
 					return v
 				}
 			}
-			error('unknkown value ' + v + ' for named strings ' + t.Name)
+			error('unknown value ' + v + ' for named strings ' + t.Name)
 		} else if (intsTypes[nt.Name]) {
 			const t = nt as Ints
 			if (typeof v !== 'number' || !Number.isInteger(v)) {
@@ -1796,7 +1797,7 @@ class verifier {
 					return v
 				}
 			}
-			error('unknkown value ' + v + ' for named ints ' + t.Name)
+			error('unknown value ' + v + ' for named ints ' + t.Name)
 		} else {
 			throw new Error('unexpected named type ' + nt)
 		}
diff --git a/webmail/api.ts b/webmail/api.ts
index 2f55d1b..8dadc76 100644
--- a/webmail/api.ts
+++ b/webmail/api.ts
@@ -1096,7 +1096,7 @@ class verifier {
 					return v
 				}
 			}
-			error('unknkown value ' + v + ' for named strings ' + t.Name)
+			error('unknown value ' + v + ' for named strings ' + t.Name)
 		} else if (intsTypes[nt.Name]) {
 			const t = nt as Ints
 			if (typeof v !== 'number' || !Number.isInteger(v)) {
@@ -1110,7 +1110,7 @@ class verifier {
 					return v
 				}
 			}
-			error('unknkown value ' + v + ' for named ints ' + t.Name)
+			error('unknown value ' + v + ' for named ints ' + t.Name)
 		} else {
 			throw new Error('unexpected named type ' + nt)
 		}
diff --git a/webmail/msg.js b/webmail/msg.js
index 119e435..8c3d9f4 100644
--- a/webmail/msg.js
+++ b/webmail/msg.js
@@ -757,7 +757,7 @@ var api;
 						return v;
 					}
 				}
-				error('unknkown value ' + v + ' for named strings ' + t.Name);
+				error('unknown value ' + v + ' for named strings ' + t.Name);
 			}
 			else if (api.intsTypes[nt.Name]) {
 				const t = nt;
@@ -772,7 +772,7 @@ var api;
 						return v;
 					}
 				}
-				error('unknkown value ' + v + ' for named ints ' + t.Name);
+				error('unknown value ' + v + ' for named ints ' + t.Name);
 			}
 			else {
 				throw new Error('unexpected named type ' + nt);
diff --git a/webmail/text.js b/webmail/text.js
index dc38131..2b548b9 100644
--- a/webmail/text.js
+++ b/webmail/text.js
@@ -757,7 +757,7 @@ var api;
 						return v;
 					}
 				}
-				error('unknkown value ' + v + ' for named strings ' + t.Name);
+				error('unknown value ' + v + ' for named strings ' + t.Name);
 			}
 			else if (api.intsTypes[nt.Name]) {
 				const t = nt;
@@ -772,7 +772,7 @@ var api;
 						return v;
 					}
 				}
-				error('unknkown value ' + v + ' for named ints ' + t.Name);
+				error('unknown value ' + v + ' for named ints ' + t.Name);
 			}
 			else {
 				throw new Error('unexpected named type ' + nt);
diff --git a/webmail/webmail.js b/webmail/webmail.js
index bf0ff3e..e02709b 100644
--- a/webmail/webmail.js
+++ b/webmail/webmail.js
@@ -757,7 +757,7 @@ var api;
 						return v;
 					}
 				}
-				error('unknkown value ' + v + ' for named strings ' + t.Name);
+				error('unknown value ' + v + ' for named strings ' + t.Name);
 			}
 			else if (api.intsTypes[nt.Name]) {
 				const t = nt;
@@ -772,7 +772,7 @@ var api;
 						return v;
 					}
 				}
-				error('unknkown value ' + v + ' for named ints ' + t.Name);
+				error('unknown value ' + v + ' for named ints ' + t.Name);
 			}
 			else {
 				throw new Error('unexpected named type ' + nt);