1package message

2

3import (

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

5)

6

7// HeaderCommentDomain returns domain name optionally followed by a message

8// header comment with ascii-only name.

9//

10// The comment is only present when smtputf8 is true and the domain name is unicode.

11//

12// Caller should make sure the comment is allowed in the syntax. E.g. for Received,

13// it is often allowed before the next field, so make sure such a next field is

14// present.

15func HeaderCommentDomain(domain dns.Domain, smtputf8 bool) string {

16 s := domain.XName(smtputf8)

17 if smtputf8 && domain.Unicode != "" {

18 s += " (" + domain.ASCII + ")"

19 }

20 return s

21}

22