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From Oleg Kalnichevski <ol...@apache.org>
Subject Re: SMTP Transport?
Date Sun, 22 Nov 2009 23:31:31 GMT
Norman Maurer wrote:
> Hi Oleg,
> I would be very interested in this :-)
> Bye,
> Norman


I finally have the library in a fairly usable (or shall I rather say 
testable) state. I can now send messages to the postfix daemon using my 
SMTP client transport and have the messages passed onto the local LMTP 
agent based on the same transport code for local delivery.

In essence I have a reasonably complete SMTP/LMTP transport library that 
implements RFC 2821 (minimum implementation), RFC 2033, plus a number of 
extensions required by LMTP: RFC 2034 (ENHANCEDSTATUSCODES), RFC 1854 

The code is still very experimental but good enough for getting the feel 
of the API.

Here's the sample of the LMTP transfer agent


Envelop validation / message delivery can be fully asynchronous. Long 
running processes such as DB or LDAP queries can be executed without 
blocking the I/O transport.

The client side transport can either be event (callback) driven


or future driven


The mail user agent can maintain a pool of persistent connections that 
can be reused for subsequent delivery requests.

The NIO framework is basically a fork of Apache HttpCore with all HTTP 
dependencies removed.


You would have to get the latest snapshots of both libraries in order to 
run samples.

I developed this code for my private use. If you do not think this is 
something that can be potentially useful for a larger user base, just 
ignore my message.



> 2009/6/12 Oleg Kalnichevski <olegk@apache.org>:
>> On Thu, Jun 11, 2009 at 04:30:58PM +0200, Markus Wiederkehr wrote:
>>> I've written a class SmtpTransport that can be used to send a Mime4j
>>> message to an SMTP server.
>>> Currently it is very simple. Meaning it is not yet capable of
>>> authentication or TLS or other extensions.
>>> Would it be worth to include this code in Mime4j?
>>> Cheers,
>>> Markus
>>> PS: Testing is a bit of a PITA with sockets and all.. Robert, could
>>> MPT help with that? I haven't looked into it yet..
>> Markus et al
>> _Coincidentally_, I have been working on a LMTP agent and LMTP client with
>> support for mandatory extensions required by LMTP [1]: PIPELINING,
>> ENHANCEDSTATUSCODES and 8BITMIME. The implementation is based a NIO framework
>> derived from HttpCore NIO and should be quite scalable. This is my private
>> project, but if there is interest in such work, I am willing to contribute it
>> to James. Alternatively you are very welcome to contribute to the effort. It is
>> ASLv2 licensed.
>> Cheers
>> Oleg
>> [1] http://www.ietf.org/rfc/rfc2033.txt

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