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A large pile of shit that I recently discovered in an open source code base from CodePlex.
public void SendMessage()
{
lock(this)
{
//do some sanity checking
if(host == null || host.Trim().Length == 0)
{
throw new Exception("No host specified.");
}
if(from == null || from.Trim().Length == 0)
{
throw new Exception("No from address.");
}
if(to.Count == 0)
{
throw new Exception("No to address.");
}
//set up initial connection
con = new SmtpConnection();
if(port <= 0) port = 25;
con.Open(host, port);
StringBuilder buf = new StringBuilder( 8192 );
string response;
int code;
//read greeting
con.GetReply(out response, out code);
//introduce ourselves
buf.Append("HELO ");
buf.Append(host);
con.SendCommand(buf.ToString());
con.GetReply(out response, out code);
buf.Length = 0;
buf.Append("MAIL FROM:<");
buf.Append(from);
buf.Append(">");
con.SendCommand(buf.ToString());
con.GetReply(out response, out code);
buf.Length = 0;
//set up list of to addresses
foreach(object o in to)
{
buf.Append("RCPT TO:<");
buf.Append(o);
buf.Append(">");
con.SendCommand(buf.ToString());
con.GetReply(out response, out code);
buf.Length = 0;
}
//set headers
con.SendCommand("DATA");
con.SendCommand("X-Mailer: smw.smtp.SmtpEmailer");
DateTime today = DateTime.Now;
buf.Append("DATE: ");
buf.Append(today.ToLongDateString());
con.SendCommand(buf.ToString());
buf.Length = 0;
buf.Append("FROM: ");
buf.Append(from);
con.SendCommand(buf.ToString());
buf.Length = 0;
buf.Append("TO: ");
buf.Append(to[0]);
for(int x = 1; x < to.Count; ++x)
{
buf.Append(";");
buf.Append(to[x]);
}
con.SendCommand(buf.ToString());
buf.Length = 0;
buf.Append("REPLY-TO: ");
buf.Append(from);
con.SendCommand(buf.ToString());
buf.Length = 0;
buf.Append("SUBJECT: ");
buf.Append( subject );
//buf.Append(subject);
con.SendCommand(buf.ToString());
buf.Length = 0;
//declare mime info for message
con.SendCommand("MIME-Version: 1.0");
if( !sendAsHtml ||
(sendAsHtml && ((SmtpAttachment.inlineCount > 0) || (SmtpAttachment.attachCount > 0)))
)
{
con.SendCommand("Content-Type: multipart/mixed; boundary=\"#SEPERATOR1#\"\r\n");
con.SendCommand("This is a multi-part message.\r\n\r\n--#SEPERATOR1#");
}
if(sendAsHtml)
{
con.SendCommand("Content-Type: multipart/related; boundary=\"#SEPERATOR2#\"");
con.SendCommand("Content-Transfer-Encoding: quoted-printable\r\n");
con.SendCommand("--#SEPERATOR2#");
}
if(sendAsHtml && SmtpAttachment.inlineCount > 0)
{
con.SendCommand("Content-Type: multipart/alternative; boundary=\"#SEPERATOR3#\"");
con.SendCommand("Content-Transfer-Encoding: quoted-printable\r\n");
con.SendCommand("--#SEPERATOR3#");
con.SendCommand("Content-Type: text/html; charset=" + m_strCharSet );
con.SendCommand("Content-Transfer-Encoding: quoted-printable\r\n");
con.SendCommand(EncodeBodyAsQuotedPrintable());
con.SendCommand("--#SEPERATOR3#");
con.SendCommand("Content-Type: text/plain; charset=" + m_strCharSet);
con.SendCommand("\r\nIf you can see this, then your email client does not support MHTML messages.");
con.SendCommand("--#SEPERATOR3#--\r\n");
con.SendCommand("--#SEPERATOR2#\r\n");
SendAttachments(buf, AttachmentLocation.Inline);
}
else
{
if(sendAsHtml)
{
con.SendCommand("Content-Type: text/html; charset=" + m_strCharSet);
con.SendCommand("Content-Transfer-Encoding: quoted-printable\r\n");
}
else
{
con.SendCommand("Content-Type: text/plain; charset=" + m_strCharSet);
con.SendCommand("Content-Transfer-Encoding: quoted-printable\r\n");
}
con.SendCommand(EncodeBodyAsQuotedPrintable());
}
if(sendAsHtml)
{
con.SendCommand("\r\n--#SEPERATOR2#--");
}
if(SmtpAttachment.attachCount > 0)
{
//send normal attachments
SendAttachments(buf, AttachmentLocation.Attachment);
}
//finish up message
con.SendCommand("");
if(SmtpAttachment.inlineCount > 0 || SmtpAttachment.attachCount > 0)
{
con.SendCommand("--#SEPERATOR1#--");
}
con.SendCommand(".");
con.GetReply(out response, out code);
con.SendCommand("QUIT");
con.GetReply(out response, out code);
con.Close();
con = null;
if(OnMailSent != null)
{
OnMailSent();
}
}
}
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