BUG: GetHeader() doesn't add quote for especials

[iredmail]

I have an email with this From: header:

From: [List] My List <list@domain.com>

Since [ and ] are especials (RFC 5322, section 3.2.3), the value doesn't need to be base64 encoded.

When getting value with GetHeader("from"), it returns wrong value:

[List] My List <list@domain.com>

Correct value should be (display name is surrounded by quote characters):

"[List] My List" <list@domain.com>

This causes mail.ParseAddress() (std) cannot parse the value of GetHeader("from") (error: mail: missing word in phrase: mail: invalid string).

net/mail package handles this correctly:

package main

import (
	"fmt"
	"net/mail"
)

func main() {
	addr := mail.Address{Name: "[List] My List", Address: "list@domain.com"}
	hdr := mail.Header{}
	hdr["From"] = []string{addr.String()}

	fmt.Printf("%s", hdr.Get("from"))
}

It prints:

"[List] My List" <list@domain.com>