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Add MIME-Version recommended header check

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Validate MIME-Version header value equals "1.0" and subtract 5 points
from the score if the header is present but invalid. Absence is not
penalized.
This commit is contained in:
nemunaire 2026-03-07 12:14:45 +07:00
commit 4245f93ce4
1 changed files with 16 additions and 0 deletions
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16
pkg/analyzer/headers.go
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@ -109,6 +109,13 @@ func (h *HeaderAnalyzer) CalculateHeaderScore(analysis *api.HeaderAnalysis) (int
maxGrade -= 1
}
// Check MIME-Version header (-5 points if present but not "1.0")
if check, exists := headers["mime-version"]; exists && check.Present {
if check.Valid != nil && !*check.Valid {
score -= 5
}
}
// Check Message-ID format (10 points)
if check, exists := headers["message-id"]; exists && check.Present {
// If Valid is set and true, award points
@ -266,6 +273,10 @@ func (h *HeaderAnalyzer) GenerateHeaderAnalysis(email *EmailMessage, authResults
headers[strings.ToLower(headerName)] = *check
}
// Check MIME-Version header (recommended but absence is not penalized)
mimeVersionCheck := h.checkHeader(email, "MIME-Version", "recommended")
headers[strings.ToLower("MIME-Version")] = *mimeVersionCheck
// Check optional headers
optionalHeaders := []string{"List-Unsubscribe", "List-Unsubscribe-Post"}
for _, headerName := range optionalHeaders {
@ -330,6 +341,11 @@ func (h *HeaderAnalyzer) checkHeader(email *EmailMessage, headerName string, imp
valid = false
headerIssues = append(headerIssues, fmt.Sprintf("Invalid date format: %v", err))
}
case "MIME-Version":
if value != "1.0" {
valid = false
headerIssues = append(headerIssues, fmt.Sprintf("MIME-Version should be '1.0', got '%s'", value))
}
case "From", "To", "Cc", "Bcc", "Reply-To", "Sender", "Resent-From", "Resent-To", "Return-Path":
// Parse address header using net/mail and get normalized address
if normalizedAddr, err := h.validateAddressHeader(value); err != nil {