diff -r f28cc30d56cb -r 1cc6c7fa803d src/goodjava/mail/Message.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/goodjava/mail/Message.java	Sun Mar 07 02:22:09 2021 -0700
@@ -0,0 +1,76 @@
+package goodjava.mail;
+
+import java.util.Map;
+import java.util.LinkedHashMap;
+import java.util.regex.Pattern;
+import java.util.regex.Matcher;
+import goodjava.util.GoodUtils;
+
+import java.net.Socket;
+
+
+public class Message {
+	public final Map<String,String> headers = new LinkedHashMap<String,String>();
+	public final String content;
+	public final String contentType;
+	private static Pattern line = Pattern.compile("(?m)^.*$");
+
+	public Message(String content) {
+		this(content,"text/plain");
+	}
+
+	public Message(String content,String contentType) {
+		this.content = content;
+		this.contentType = contentType;
+	}
+
+	public String toText() {
+		StringBuilder sb = new StringBuilder();
+		for( Map.Entry<String,String> entry : headers.entrySet() ) {
+			String name = entry.getKey();
+			if( name.equalsIgnoreCase("bcc") )
+				continue;
+			String value = entry.getValue();
+			sb.append( name ).append( ": " ).append( value ).append( "\r\n" );
+		}
+		sb.append( "Content-Type: " ).append( contentType ).append( "; charset=\"UTF-8\"\r\n" );
+		boolean isAscii = content.matches("\\p{ASCII}*");
+		if( !isAscii )
+			sb.append( "Content-Transfer-Encoding: base64\r\n" );
+		sb.append( "\r\n" );
+		if( isAscii ) {
+			Matcher m = line.matcher(content);
+			while( m.find() ) {
+				sb.append(m.group()).append("\r\n");		
+			}
+		} else {
+			String s = GoodUtils.base64Encode(content);
+			int n = s.length() - 76;
+			int i;
+			for( i=0; i<n; i+=76 ) {
+				sb.append(s.substring(i,i+76)).append("\r\n");
+			}
+			sb.append(s.substring(i)).append("\r\n");
+		}
+		return sb.toString();
+	}
+
+	public static void main(String[] args) throws Exception {
+		String text = ""
+			+"testm 2\n"
+			+"x\n"
+//			+"产品\n"
+			+"rg; ;lrg dsl rgj errlgerrg neskrjg skrg rdsg drskrg sd;gr s;kgr skrg skrg sdg ds fg;ks gegr erg ;sg sd; g;sdr gsklrg sg s;kkrg s;hg ;slrg ;elrg ;reg r;g ;r g;er g;ler g;e g; g;r g rg; srkd fjl kj kklsjrg lsk gskdf;rs gkrj glj grekjs lksjgkjn kjslg rklrg ;rsd; kj drsg akrglk kalrgklrsdnrgkgj;r ;s ns b;n;sn ;njslk r;n\r\n"
+		;
+		Message msg = new Message(text);
+		msg.headers.put("From","smtp@luan.software");
+		msg.headers.put("To","fschmidt@gmail.com");
+		msg.headers.put("Subject","test");
+		Socket socket = new Socket("smtpcorp.com",2525);
+		Smtp smtp = new Smtp(socket);
+		smtp.authenticate("smtp@luan.software","luanhost");
+		smtp.send(msg);
+		smtp.close();
+		System.out.println("done msg");
+	}
+}

diff -r f28cc30d56cb -r 1cc6c7fa803d src/goodjava/mail/Smtp.java
--- a/src/goodjava/mail/Smtp.java	Sat Mar 06 21:13:34 2021 -0700
+++ b/src/goodjava/mail/Smtp.java	Sun Mar 07 02:22:09 2021 -0700
@@ -6,7 +6,8 @@
 import java.io.OutputStreamWriter;
 import java.io.IOException;
 import java.net.Socket;
-import java.util.Base64;
+import java.util.Map;
+import goodjava.util.GoodUtils;
 
 
 public class Smtp {
@@ -29,6 +30,35 @@
 			throw new SmtpException(ehlo);
 	}
 
+	public String authenticate(String username,String password) throws IOException, SmtpException {
+		String s = "\0" + username + "\0" + password;
+		s = GoodUtils.base64Encode(s);
+		write( "AUTH PLAIN " + s + "\r\n" );
+		String r = read();
+		if( !r.startsWith("235") )
+			throw new SmtpException(r);
+		return r;
+	}
+
+	public void send(Message msg) throws IOException, SmtpException {
+		for( Map.Entry<String,String> entry : msg.headers.entrySet() ) {
+			String name = entry.getKey();
+			String value = entry.getValue();
+			if( name.equalsIgnoreCase("from") ) {
+				from(value);
+			}
+			if( name.equalsIgnoreCase("to")
+				|| name.equalsIgnoreCase("cc")
+				|| name.equalsIgnoreCase("bcc")
+			) {
+				for( String s : value.split(",") ) {
+					to(s);
+				}
+			}
+		}
+		data( msg.toText() );
+	}
+
 	public void close() throws IOException, SmtpException {
 		write( "QUIT\r\n" );
 		String s = read();
@@ -37,16 +67,6 @@
 		socket.close();
 	}
 
-	public String authenticate(String username,String password) throws IOException, SmtpException {
-		String s = "\0" + username + "\0" + password;
-		s = Base64.getEncoder().encodeToString(s.getBytes());
-		write( "AUTH PLAIN " + s + "\r\n" );
-		String r = read();
-		if( !r.startsWith("235") )
-			throw new SmtpException(r);
-		return r;
-	}
-
 	public String from(String address) throws IOException, SmtpException {
 		write( "MAIL FROM: " + address + "\r\n" );
 		String r = read();
@@ -93,11 +113,12 @@
 		Smtp smtp = new Smtp(socket);
 		smtp.authenticate("smtp@luan.software","luanhost");
 		smtp.from("smtp@luan.software");
-		smtp.to("fschmidt@gmail.com");
+		smtp.to(" fschmidt@gmail.com");
 		String text = "\r\n"
-			+"test2\r\n"
+			+"test3\r\n"
 			+".q\r\n"
 			+"x\r\n"
+			+"rg; ;lrg dsl rgj errlgerrg neskrjg skrg rdsg drskrg sd;gr s;kgr skrg skrg sdg ds fg;ks gegr erg ;sg sd; g;sdr gsklrg sg s;kkrg s;hg ;slrg ;elrg ;reg r;g ;r g;er g;ler g;e g; g;r g rg; srkd fjl kj kklsjrg lsk gskdf;rs gkrj glj grekjs lksjgkjn kjslg rklrg ;rsd; kj drsg akrglk kalrgklrsdnrgkgj;r ;s ns b;n;sn ;njslk r;n\r\n"
 		;
 		smtp.data(text);
 		smtp.close();

diff -r f28cc30d56cb -r 1cc6c7fa803d src/goodjava/util/GoodUtils.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/goodjava/util/GoodUtils.java	Sun Mar 07 02:22:09 2021 -0700
@@ -0,0 +1,20 @@
+package goodjava.util;
+
+import java.io.UnsupportedEncodingException;
+import java.util.Base64;
+
+
+public final class GoodUtils {
+
+	public static byte[] getBytes(String s,String charsetName) {
+		try {
+			return s.getBytes(charsetName);
+		} catch(UnsupportedEncodingException e) {
+			throw new RuntimeException(e);
+		}
+	}
+
+	public static String base64Encode(String s) {
+		return Base64.getEncoder().encodeToString(getBytes(s,"UTF-8"));
+	}
+}