Some emails retrieved by header.Get may not be transcoded

[ltybenet]

Secondary transcoding using DecodeRFC2047 is successful

subject := header.Get("Subject")
if strings.Contains(subject, "=?") {
    subject = enmime.DecodeRFC2047(subject)
}

[jhillyerd]

I'd need more info to be able to investigate this. What is header in the snippet you posted? Do you have a sample subject line?

[ltybenet]

The header of the file "1.eml" is the following characters
// Subject: =?iso-2022-jp?B?MRskQjdvJE49ODJZJE5ESTJDJEgkSiRqJF4kOSEjGyhC?=

This is part of my code

f, err := os.Open("1.eml")
if err != nil {
    a.log.Error("Open file error", f.Name(), err)
}
defer f.Close()
reader := bufio.NewReader(f)
var p enmime.ErrorCollector
header, err := enmime.ReadHeader(reader, p)
if err != nil {
    a.log.Error(fmt.Sprintf("Error, %s %s", f.Name(), err.Error()))
}

subject := header.Get("Subject")
if strings.Contains(subject, "=?") {
    subject = enmime.DecodeRFC2047(subject)
}