1package mtasts_test

2

3import (

4 "context"

5 "errors"

6 "log"

7 "log/slog"

8

9 "github.com/mjl-/mox/dns"

10 "github.com/mjl-/mox/mtasts"

11)

12

13func ExampleGet() {

14 ctx := context.Background()

15 resolver := dns.StrictResolver{}

16

17 // Get for example.org does a DNS TXT lookup at _mta-sts.example.org.

18 // If the record exists, the policy is fetched from https://mta-sts.<domain>/.well-known/mta-sts.txt, and parsed.

19 record, policy, policyText, err := mtasts.Get(ctx, slog.Default(), resolver, dns.Domain{ASCII: "example.org"})

20 if err != nil {

21 log.Printf("looking up mta-sts record and fetching policy: %v", err)

22 if !errors.Is(err, mtasts.ErrDNS) {

23 log.Printf("domain does not implement mta-sts")

24 }

25 // Continuing, we may have a record but not a policy.

26 } else {

27 log.Printf("domain implements mta-sts")

28 }

29 if record != nil {

30 log.Printf("mta-sts DNS record: %#v", record)

31 }

32 if policy != nil {

33 log.Printf("mta-sts policy: %#v", policy)

34 log.Printf("mta-sts policy text:\n%s", policyText)

35 }

36}

37