diff -r c0ef8acf069d -r fcca0ddf5a4d src/luan/modules/mail/Mail.luan
--- a/src/luan/modules/mail/Mail.luan	Fri Mar 12 18:06:15 2021 -0700
+++ b/src/luan/modules/mail/Mail.luan	Fri Mar 12 20:12:43 2021 -0700
@@ -3,12 +3,13 @@
 local error = Luan.error
 local type = Luan.type or error()
 local System = require "java:java.lang.System"
-local SmtpCon = require "java:luan.modules.mail.SmtpCon"
+--local SmtpCon = require "java:luan.modules.mail.SmtpCon"
+local SmtpCon = require "java:luan.modules.mail.MailCon"
 
 
 local Mail = {}
 
-System.setProperty( "mail.mime.charset", "UTF-8" )
+--System.setProperty( "mail.mime.charset", "UTF-8" )
 
 function Mail.Sender(params)
 	type(params)=="table" or error()

diff -r c0ef8acf069d -r fcca0ddf5a4d src/luan/modules/mail/MailCon.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/luan/modules/mail/MailCon.java	Fri Mar 12 20:12:43 2021 -0700
@@ -0,0 +1,106 @@
+package luan.modules.mail;
+
+import java.io.IOException;
+import java.net.Socket;
+import java.util.Map;
+import java.util.LinkedHashMap;
+import java.util.List;
+import goodjava.mail.Message;
+import goodjava.mail.Smtp;
+import goodjava.mail.MailException;
+import luan.Luan;
+import luan.LuanTable;
+import luan.LuanException;
+
+
+public final class MailCon {
+	private final String host;
+	private final int port;
+	private final String username;
+	private final String password;
+
+	public MailCon(LuanTable paramsTbl) throws LuanException {
+		Map<Object,Object> params = paramsTbl.asMap();
+
+		String host = getString(params,"host");
+		if( host==null )
+			throw new LuanException( "parameter 'host' is required" );
+		this.host = host;
+
+		Object port = params.remove("port");
+		if( port==null )
+			throw new LuanException( "parameter 'port' is required" );
+		if( !(port instanceof Number) )
+			throw new LuanException( "parameter 'port' must be an integer" );
+		Integer i = Luan.asInteger(port);
+		if( i == null )
+			throw new LuanException( "parameter 'port' must be an integer" );
+		this.port = i;
+
+		this.username = getString(params,"username");
+		this.password = getString(params,"password");
+		if( this.username!=null && this.password==null )
+			throw new LuanException( "password required with username" );
+		if( this.username==null && this.password!=null )
+			throw new LuanException( "username required with password" );
+
+		if( !params.isEmpty() )
+			throw new LuanException( "unrecognized parameters: "+params );
+	}
+
+	private static String getString(Map<Object,Object> params,String key) throws LuanException {
+		Object val = params.remove(key);
+		if( val!=null && !(val instanceof String) )
+			throw new LuanException( "parameter '"+key+"' must be a string" );
+		return (String)val;
+	}
+
+	private static Message message(LuanTable mailTbl) throws LuanException {
+		Map<Object,Object> mailParams = mailTbl.asMap();
+		Object body = mailParams.remove("body");
+		if( body == null )
+			throw new LuanException( "parameter 'body' is required" );
+		if( body instanceof LuanTable ) {
+			LuanTable tbl = (LuanTable)body;
+			if( !tbl.isList() )
+				throw new LuanException( "body table must be a list" );
+			List list = tbl.asList();
+			Message[] msgs = new Message[list.size()];
+			for( int i=0; i<msgs.length; i++ ) {
+				Object obj = list.get(i);
+				if( !(obj instanceof LuanTable) )
+					throw new LuanException( "body table must be a list of part tables" );
+				msgs[i] = message((LuanTable)obj);
+			}
+			body = msgs;
+		}
+		Map<String,String> headers = new LinkedHashMap<String,String>();
+		boolean hasContentType = false;
+		for( Map.Entry<Object,Object> entry : mailParams.entrySet() ) {
+			Object key = entry.getKey();
+			Object value = entry.getValue();
+			if( !(key instanceof String) )
+				throw new LuanException( "keys must be strings" );
+			if( !(value instanceof String) )
+				throw new LuanException( "value for '"+key+"' must be string" );
+			String name = (String)key;
+			headers.put(name,(String)value);
+			if( name.equalsIgnoreCase("content-type") )
+				hasContentType = true;
+		}
+		if( !hasContentType && body instanceof String )
+			headers.put("Content-Type","text/plain; charset=utf-8");
+		return new Message(headers,body);
+	}
+
+	public void send(LuanTable mailTbl) throws LuanException, IOException, MailException {
+		Message msg = message(mailTbl);
+		Socket socket = new Socket(host,port);
+		Smtp smtp = new Smtp(socket);
+		if( username != null )
+			smtp.authenticate(username,password);
+		smtp.send(msg);
+		smtp.close();
+	}
+
+}