internal void PrepareHeaders(bool sendEnvelope, bool allowUnicode)
{
string headerName;
if (_headersEncoding == null)
{
_headersEncoding = Encoding.GetEncoding(MimeBasePart.DefaultCharSet);
}
//ContentType is written directly to the stream so remove potential user duplicate
Headers.Remove(MailHeaderInfo.GetString(MailHeaderID.ContentType));
Headers[MailHeaderInfo.GetString(MailHeaderID.MimeVersion)] = "1.0";
// add sender to headers first so that it is written first to allow the IIS smtp svc to
// send MAIL FROM with the sender if both sender and from are present
headerName = MailHeaderInfo.GetString(MailHeaderID.Sender);
if (Sender != null && EmitSenderHeader)
{
Headers.InternalAdd(headerName, Sender.Encode(headerName.Length, allowUnicode));
}
else
{
Headers.Remove(headerName);
}
headerName = MailHeaderInfo.GetString(MailHeaderID.From);
Headers.InternalAdd(headerName, From.Encode(headerName.Length, allowUnicode));
if (AutomaticallyBuildAndApplyRecipientHeaders)
{
headerName = MailHeaderInfo.GetString(MailHeaderID.To);
if (To.Count > 0)
{
Headers.InternalAdd(headerName, To.Encode(headerName.Length, allowUnicode));
}
else
{
Headers.Remove(headerName);
}
headerName = MailHeaderInfo.GetString(MailHeaderID.Cc);
if (CC.Count > 0)
{
Headers.InternalAdd(headerName, CC.Encode(headerName.Length, allowUnicode));
}
else
{
Headers.Remove(headerName);
}
}
headerName = MailHeaderInfo.GetString(MailHeaderID.ReplyTo);
if (ReplyTo != null)
{
Headers.InternalAdd(headerName, ReplyTo.Encode(headerName.Length, allowUnicode));
}
else if (ReplyToList.Count > 0)
{
Headers.InternalAdd(headerName, ReplyToList.Encode(headerName.Length, allowUnicode));
}
else
{
Headers.Remove(headerName);
}
if (!DisplayBccHeader)
{
Headers.Remove(MailHeaderInfo.GetString(MailHeaderID.Bcc));
}
if (AutomaticallyBuildAndApplyRecipientHeaders && DisplayBccHeader && Bcc.Count > 0)
{
Headers.Remove(MailHeaderInfo.GetString(MailHeaderID.Bcc));
headerName = MailHeaderInfo.GetString(MailHeaderID.Bcc);
Headers.InternalAdd(headerName, Bcc.Encode(headerName.Length, allowUnicode));
}
if (_priority == MailPriority.High)
{
Headers[MailHeaderInfo.GetString(MailHeaderID.XPriority)] = "1";
Headers[MailHeaderInfo.GetString(MailHeaderID.Priority)] = "urgent";
Headers[MailHeaderInfo.GetString(MailHeaderID.Importance)] = "high";
}
else if (_priority == MailPriority.Low)
{
Headers[MailHeaderInfo.GetString(MailHeaderID.XPriority)] = "5";
Headers[MailHeaderInfo.GetString(MailHeaderID.Priority)] = "non-urgent";
Headers[MailHeaderInfo.GetString(MailHeaderID.Importance)] = "low";
}
//if the priority was never set, allow the app to set the headers directly.
else if (((int)_priority) != -1)
{
Headers.Remove(MailHeaderInfo.GetString(MailHeaderID.XPriority));
Headers.Remove(MailHeaderInfo.GetString(MailHeaderID.Priority));
Headers.Remove(MailHeaderInfo.GetString(MailHeaderID.Importance));
}
Headers.InternalAdd(MailHeaderInfo.GetString(MailHeaderID.Date),
MailBnfHelper.GetDateTimeString(Date, null));
headerName = MailHeaderInfo.GetString(MailHeaderID.Subject);
if (!string.IsNullOrEmpty(_subject))
{
if (allowUnicode)
{
Headers.InternalAdd(headerName, _subject);
}
else
{
Headers.InternalAdd(headerName,
MimeBasePart.EncodeHeaderValue(_subject, _subjectEncoding,
MimeBasePart.ShouldUseBase64Encoding(_subjectEncoding) && !PreferQEncodeForHeaders,
headerName.Length));
}
}
else
{
Headers.Remove(headerName);
}
EncodeHeaders(_headers, allowUnicode);
}