RE: SMTP Email Client

Question

Not long time ago I was trying to send an email from within Forte using
SMTP. And believe it or not it works just fine.
From what I can tell, Keith, you know the steps to send it, but missingfew concepts in how the SMTP works. It is simple, but not that simple.
So you know how to create outbound connection (using
ExternalConnection):
myConnection.Open ( rcptMailServer.com, 25, NIL,
CM_ADDR_INTERNET_NAME );
Once you have that reference you would send a 'HELO' string and wait for
response, the trick here is to use memoryBuffer to do that, as probably
you knew that:
pTextToSend = pTextToSend.concat('\n'); -- be sure to always add
new line character
-- send string to the mail server
aBuffer.Open( SP_AM_READ_WRITE, TRUE );
aBuffer.WriteText( pTextToSend );
length = pTextToSend.actualSize;
aConnection.Write( aBuffer, length );
aBuffer.Close();
-- receive response from the mail server
aBuffer.Open( SP_AM_READ_WRITE, TRUE );
length = cBufferSize;
while TRUE do
aConnection.Read ( aBuffer, length );
aBuffer.ReadText( lTempText );
lReceivedText.concat( lTempText );
if length < cBufferSize then
exit;
end if;
end while;
aBuffer.Close();
NOTE: for the first 'HELO' write you need to read the response twice! -
it will not work promptly otherwise.
Then using same technique (and code for send/receive) send the following
(in that order!):
send('MAIL FROM: <[email protected]>');
receiveResponse();
send('RCPT TO: <friend@rcptMailServer>');
receiveResponse();
send( 'DATA' );
receiveResponse();
send( myMsgString );
where myMsgString is something like:
myMsgString : TextData = new();
myMsgString .concat('From:
').concat(pFromAddr).concat('\n');
myMsgString .concat('To:
').concat(pToAddr).concat('\n');
myMsgString .concat('Cc:
').concat(pCcAddr).concat('\n');
myMsgString .concat('Subject:
').concat(pSubject).concat('\n\n'); -- that is here for purpose
myMsgString .concat(pMsg).concat('\n').concat('.'); --
the DOT is here for purpose too!
receiveResponse();
send( 'QUIT' );
receiveResponse();
and finally
aConnection.Close();
Well, I do not think there is anythink left, is there? (well there is
multiple address, files attachment, etc, but I will not go into that).
So, good luck, hope it helps!
Dariusz Rakowicz
Consultant
BORN Information Services (http://www.born.com)
8101 E. Prentice Ave, Suite 310
Englewood, CO 80111
303-846-8273
[email protected]
-----Original Message-----
From: Keith Wells [SMTP:[email protected]]
Sent: Thursday, August 13, 1998 4:12 PM
To: [email protected]
Subject: SMTP Email Client
I seem to be able to create an outbound connection with my server, but
I
do not receive any mail. My port setting is 25 which is the port for
my
mail system, and I have submitted my address as both host name and ip.
Has anyone used forte to create an smtp email client?
I have tested for the following exceptions, but everything seems fine.
UsageException
SystemResourceException
RemoteAccessException
While testing this app, I built my text file by doing the following:
CompleteMessage = CompleteMessage.concat('HELO\t');
CompleteMessage = CompleteMessage.concat('mailhost.myhost.com\r\n');
CompleteMessage = CompleteMessage.concat('MAIL\t');
CompleteMessage = CompleteMessage.concat('FROM:
<[email protected]>\r\n');
CompleteMessage = CompleteMessage.concat('RCPT\t');
CompleteMessage = CompleteMessage.concat('TO:
<[email protected]>\r\n');
CompleteMessage = CompleteMessage.concat('DATA\r\n');
CompleteMessage = CompleteMessage.concat('This Is my test
data!!\r\n');
CompleteMessage = CompleteMessage.concat('QUIT\r\n');
The SMTP commands seem to be correct.
Any assistance would be appreciated.
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Answer 1

A problem with whitelisting is that spammers often use your domain or an address as the from address.
Another method (out of 100s of methods) is to use an alternate smtp port for mail submission and have content filtering on that port disabled. An example, added to master.cf is:
587 inet n - n - - smtpd
-o smtpdclientrestrictions=
-o smtpdrecipient_restrictions=permit_saslauthenticated,reject
-o content_filter=
The above removes all client and recip restrictions, only allows sasl_auth users and bypasses the content filter. You could modify other main.cf features specifically for this port and it's users, for example you could specific a larger mailboxsizelimit or require TLS, etc.
The downside to this... you have no virus checking of outbound mail submitted by your users, the upside is less resource consumption checking every outbound (or local) message submitted and more control over the features of the submission port.
Jeff