115 lines
3.1 KiB
Go
115 lines
3.1 KiB
Go
// This file is part of the happyDeliver (R) project.
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// Copyright (c) 2025 happyDomain
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// Authors: Pierre-Olivier Mercier, et al.
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//
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// This program is offered under a commercial and under the AGPL license.
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// For commercial licensing, contact us at <contact@happydomain.org>.
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//
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// For AGPL licensing:
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <https://www.gnu.org/licenses/>.
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package analyzer
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import (
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"context"
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"fmt"
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"git.happydns.org/happyDeliver/internal/api"
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)
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// checkMXRecords looks up MX records for a domain
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func (d *DNSAnalyzer) checkMXRecords(domain string) *[]api.MXRecord {
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ctx, cancel := context.WithTimeout(context.Background(), d.Timeout)
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defer cancel()
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mxRecords, err := d.resolver.LookupMX(ctx, domain)
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if err != nil {
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return &[]api.MXRecord{
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{
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Valid: false,
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Error: api.PtrTo(fmt.Sprintf("Failed to lookup MX records: %v", err)),
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},
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}
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}
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if len(mxRecords) == 0 {
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return &[]api.MXRecord{
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{
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Valid: false,
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Error: api.PtrTo("No MX records found"),
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},
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}
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}
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var results []api.MXRecord
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for _, mx := range mxRecords {
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results = append(results, api.MXRecord{
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Host: mx.Host,
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Priority: mx.Pref,
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Valid: true,
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})
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}
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return &results
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}
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func (d *DNSAnalyzer) calculateMXScore(results *api.DNSResults) (score int) {
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// Having valid MX records is critical for email deliverability
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// From domain MX records (half points) - needed for replies
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if results.FromMxRecords != nil && len(*results.FromMxRecords) > 0 {
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hasValidFromMX := false
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for _, mx := range *results.FromMxRecords {
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if mx.Valid {
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hasValidFromMX = true
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break
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}
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}
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if hasValidFromMX {
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score += 50
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}
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}
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// Return-Path domain MX records (10 points) - needed for bounces
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if results.RpMxRecords != nil && len(*results.RpMxRecords) > 0 {
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hasValidRpMX := false
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for _, mx := range *results.RpMxRecords {
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if mx.Valid {
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hasValidRpMX = true
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break
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}
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}
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if hasValidRpMX {
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score += 50
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}
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} else if results.RpDomain != nil && *results.RpDomain != results.FromDomain {
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// If Return-Path domain is different but has no MX records, it's a problem
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// Don't deduct points if RP domain is same as From domain (already checked)
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} else {
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// If Return-Path is same as From domain, give full 10 points for RP MX
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if results.FromMxRecords != nil && len(*results.FromMxRecords) > 0 {
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hasValidFromMX := false
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for _, mx := range *results.FromMxRecords {
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if mx.Valid {
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hasValidFromMX = true
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break
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}
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}
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if hasValidFromMX {
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score += 50
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}
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}
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}
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return
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}
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