#18: implement SMTP Submission (587/465), SASL PLAIN/LOGIN auth and preflight diagnostics

services/protocols/internal/domain/valueobject/domain_name.go

@@ -11,9 +11,9 @@ type DomainName struct {
 }
 
 var (
-	ErrDomainNameEmpty         = errors.New("domain name: must not be empty")
-	ErrDomainNameNotFQDN       = errors.New("domain name: must contain at least one dot (not a FQDN)")
-	ErrDomainNameInvalidLabel  = errors.New("domain name: label must not start or end with a hyphen")
+	ErrDomainNameEmpty        = errors.New("domain name: must not be empty")
+	ErrDomainNameNotFQDN      = errors.New("domain name: must contain at least one dot (not a FQDN)")
+	ErrDomainNameInvalidLabel = errors.New("domain name: label must not start or end with a hyphen")
 )
 
 // NewDomainName validates and normalizes raw into a DomainName.

services/protocols/internal/domain/valueobject/email_address.go

@@ -14,9 +14,9 @@ type EmailAddress struct {
 }
 
 var (
-	ErrEmailMissingAtSign  = errors.New("email address: missing '@' separator")
-	ErrEmailEmptyLocalPart = errors.New("email address: local part must not be empty")
-	ErrEmailEmptyDomain    = errors.New("email address: domain must not be empty")
+	ErrEmailMissingAtSign    = errors.New("email address: missing '@' separator")
+	ErrEmailEmptyLocalPart   = errors.New("email address: local part must not be empty")
+	ErrEmailEmptyDomain      = errors.New("email address: domain must not be empty")
 	ErrEmailLocalPartTooLong = errors.New("email address: local part exceeds 64 octets (RFC 5321 4.5.3.1.1)")
 )
 

services/protocols/internal/domain/valueobject/message_id.go

@@ -11,7 +11,7 @@ type MessageID struct {
 }
 
 var (
-	ErrMessageIDEmpty       = errors.New("message id: must not be empty")
+	ErrMessageIDEmpty        = errors.New("message id: must not be empty")
 	ErrMessageIDNotBracketed = errors.New("message id: must be wrapped in angle brackets")
 )
 

services/protocols/internal/domain/valueobject/spam_verdict_test.go

@@ -12,7 +12,7 @@ func TestSpamVerdictFromScore_MatchesThresholds(t *testing.T) {
 		{3.9, SpamHam},
 		{4, SpamProbable},
 		{8.9, SpamProbable},
-		{9, SpamReject},   // section 10.1: 9-15 greylists/defers, modeled here as reject-eligible
+		{9, SpamReject}, // section 10.1: 9-15 greylists/defers, modeled here as reject-eligible
 		{15.1, SpamReject},
 	}
 	for _, c := range cases {