带有amazonses.com的AWS SES SendRawEmail警告

Question

Hi I'm sending raw emails with attachemnts from Amazon AWS SES using raw format. To prepare the message I'm using the library github.com/domodwyer/mailyak and the following code. The problemn is that I'm receiving the "via amazonses.com" warning on GMail. When I send the email using SendEmail method I didn't get this warning. My domain and email has the DKIM signature. I also found this question from a similar issue, but also without solution.

The mail-tester website says that my message is has two DKIM signatures, one from my domain and other from amazonses.com

mail := mailyak.New("", nil)
mail.To(destinatario)
mail.From(remetente)
mail.FromName(remetenteNome)
mail.Subject(titulo)

if err := templateConteudo.ExecuteTemplate(mail.HTML(), "conteudo", emailData{Parametros: *parametros}); err != nil {
    log.Println(err)
    return
}

if anexos != nil {
    for _, anexo := range anexos {
        mail.Attach(anexo.Nome, *anexo.Arquivo)
    }
}

buffer, err := mail.MimeBuf()
if err != nil {
    log.Println(err)
    return
}
dados, err := ioutil.ReadAll(buffer)
if err != nil {
    log.Println(err)
    return
}

dadosSES := &ses.SendRawEmailInput{
    RawMessage: &ses.RawMessage{
        Data: dados,
    },
}

if _, err := sesCTX.SendRawEmail(dadosSES); err != nil {
    log.Println(err)
    return
}

Answer 1

According this question when the from descrition has special characters it fails to DKIM authentication. So I just mime encoded it using the following code.

mail.FromName(mime.QEncoding.Encode("UTF-8", remetenteNome))