SMTP Client

[J]

I am starting a new project to create a SMTP Client for Windows; I am
using the winsock2 library. When I use the following commands I get an
error (550):

220 ns1.zanmo.com ESMTP Exim 4.69 Mon, 08 Feb 2010 17:58:41 -0800
HELO world
250 ns1.zanmo.com Hello 60.sub-75-229-11.myvzw.com [75.229.11.60]
MAIL FROM: (e-mail address removed)
250 OK
RCPT TO: (e-mail address removed)
550 authentication required
QUIT
221 ns1.zanmo.com closing connection

Please explain how to authenticate the session, and how do I
Programmatically MX Lookup also using MX record?

 

[Nick Keighley]

I am starting a new project to create a SMTP Client for Windows; I am
using the winsock2 library. When I use the following commands I get an
error (550):

220 ns1.zanmo.com ESMTP Exim 4.69 Mon, 08 Feb 2010 17:58:41 -0800
HELO world
250 ns1.zanmo.com Hello 60.sub-75-229-11.myvzw.com [75.229.11.60]
MAIL FROM: (e-mail address removed)
250 OK
RCPT TO: (e-mail address removed)
550 authentication required
QUIT
221 ns1.zanmo.com closing connection

Please explain how to authenticate the session, and how do I
Programmatically MX Lookup also using MX record?

try a better newsgroup. Maybe a microsoft one

 

[Richard Tobin]

Please explain how to authenticate the session

See http://tools.ietf.org/rfc/rfc4954.txt

-- Richard

 

[Luuk]

Op 9-2-2010 10:27, Nick Keighley schreef:

I am starting a new project to create a SMTP Client for Windows; I am
using the winsock2 library. When I use the following commands I get an
error (550):

220 ns1.zanmo.com ESMTP Exim 4.69 Mon, 08 Feb 2010 17:58:41 -0800
HELO world
250 ns1.zanmo.com Hello 60.sub-75-229-11.myvzw.com [75.229.11.60]
MAIL FROM: (e-mail address removed)
250 OK
RCPT TO: (e-mail address removed)
550 authentication required
QUIT
221 ns1.zanmo.com closing connection

Please explain how to authenticate the session, and how do I
Programmatically MX Lookup also using MX record?

try a better newsgroup. Maybe a microsoft one

microsoft does not do,

this suggegtion comes as close as redirecting someone who askes about C
to 'Borland', because they write (or wrote?) c-compilers...

 

[Nobody]

I am starting a new project to create a SMTP Client for Windows; I am
using the winsock2 library. When I use the following commands I get an
error (550):

220 ns1.zanmo.com ESMTP Exim 4.69 Mon, 08 Feb 2010 17:58:41 -0800
HELO world
250 ns1.zanmo.com Hello 60.sub-75-229-11.myvzw.com [75.229.11.60]
MAIL FROM: (e-mail address removed)
250 OK
RCPT TO: (e-mail address removed)
550 authentication required
QUIT
221 ns1.zanmo.com closing connection

Please explain how to authenticate the session,

http://tools.ietf.org/html/rfc4954

More generally:

http://en.wikipedia.org/wiki/SMTP#Related_Requests_For_Comments

and how do I
Programmatically MX Lookup also using MX record?

Dunno, but DnsQuery() looks promising. If you want a better answer, ask on
a Windows group.

 

[Nick Keighley]

Op 9-2-2010 10:27, Nick Keighley schreef:

I am starting a new project to create a SMTP Client for Windows; I am
using the winsock2 library. When I use the following commands I get an
error (550):
220 ns1.zanmo.com ESMTP Exim 4.69 Mon, 08 Feb 2010 17:58:41 -0800
HELO world
250 ns1.zanmo.com Hello 60.sub-75-229-11.myvzw.com [75.229.11.60]
MAIL FROM: (e-mail address removed)
250 OK
RCPT TO: (e-mail address removed)
550 authentication required
QUIT
221 ns1.zanmo.com closing connection
Please explain how to authenticate the session, and how do I
Programmatically MX Lookup also using MX record?

try a better newsgroup. Maybe a microsoft one

microsoft does not do,

this suggegtion comes as close as redirecting someone who askes about C
to 'Borland', because they write (or wrote?) c-compilers...

<shrug> he said he was developing a for windows so I thought a windows
might be some use. I must admit I didn't understand his question.

 

[Nobody]

Now what does authentication mean? Well, the server like to know *who*
the client is, but hey if that is done via a *shared secret*, isn't it a
pretty bad idea to send such important info out in the great void, also
known as internet???

It's an improvement over running an open relay.

There's only so much to be gained from better security when a good
proportion of your users are likely to be infested with malware.