Sending email using Qt.

[nielsenj]

Hi guys,

I am working on a SMTP client too and I do quite the same things as in the Qt example (btw. I didnt remember there was such an example ).
The problem is my app won't connect if I don't call waitForConnected()!

But isnt this method useless if we wand non-blocking sockets?
Other code examples simply call connectToHost(...) after setting up the right connections.
If I don't call waitForConnected() the socket status remains on LookingUpHost (or whatever the exact name is)

Any clue???

The example was only in the QT 3.x series under networking examples, i just altered it to work in QT 4.x.

My understanding of the "waitForConnected()" function is that it's simply a delay to allow a handshake to occur, it doesn't actually do anything unless you want to establish a timeout (lets say for a server that's offline) and take the bool return to do error correction.

Basically it is a delay before completing the socket.

I removed the "waitForConnected()" from my client and it established a connection immediately, but my mail server is also on the company lan and connects extremely quickly.

Using the "waitForConnected()" function should have no effect on how you connect unless you choose to implement error correction based on it's return.

If you don't want to use it then i suggest putting a delay in, something like 10-15 seconds, which is close to a worst case connection delay for most internet applications.

Of course if you use "waitForConnected(15000)" then it will automatically stop the delay after either 15 seconds (a timeout) or you establish a connection (if it's less than the passed 15 seconds), which would make sense to minimize the time your application is waiting.

J

[pinktroll]

Even this Post is old, it was very usefull for me. So a big thank you!!
But i have to notes for using MS Exchange Server (in my case Version 2000).
You have to change two things inside the code:

1. Don´t remove

   if (smtpsocket->waitForConnected(Timeout))

   if (smtpsocket->waitForConnected(Timeout))

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   or no mails will be send. Instead decrease the timeout, i.e. 500.
2. In function "PutSendLine()", in step "case 4"
   replace the response "ok" with "Authentication successful" because this is the real responce and it wont work else.

[Ryczypisk]

Hello,
I'm newbie and I'd like to understand correctly this code.
Could you write what is the "output" is it sth. like stdout?:

void Smtp::connected()
{
    output->append("connected");
    qDebug() << "Connected ";
}

void Smtp::connected()
{
    output->append("connected");
    qDebug() << "Connected ";
}

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thanks

[kremuwa]

I used the structure from the post #9, taking into account post #11 (especially the second note). I am successfully connecting to the server and sending it those "lines" until it comes to send line number 7 (function PutSendLine(), case 7) - it's an actual message. After this line:

response = SendLineAndGrab(message+"\r\n.");

response = SendLineAndGrab(message+"\r\n.");

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I'm receiving such a response from a server:

"550 5.5.2 Unknown command 'Date: Mon, 8 Mar 2010 15:54:26'

I have tried to remove the date (by commenting one of the first lines in smtp.cpp), but then I received similar response but this time it was aobut "User-Agent: Mozilla Thunderbird 1.0.6...".

Why is the server sending such responses? How to make it work?

[obizy]

in step 5
SendLineAndGrab("MAIL FROM: "+from);
someserver return:
501 Bad address syntax
so this line must chang to:
SendLineAndGrab("MAIL FROM:<"+from+">");

[racinglocura07]

How can we add to this code an option to send attached files?

[squidge]

7-bit encode the attachments using something like Base64 and then attach them to the body of the email as a MIME attachment making sure that the message and each attachment has a different id so that the receiving email client knows how to seperate the parts again.

[estanisgeyer]

See POCO Libraries, its very helpfull
http://pocoproject.org

[little_su]

thank you very much

[tetris11]

Can someone post some working code please? It'd be much appreciated and save the rest of us a lot of time and effort.
Sure, we could dig at this for a few days and get it to eventually work -- but why climb a mountain when someone's already built an escalator?

Cheers in advance

[racinglocura07]

7-bit encode the attachments using something like Base64 and then attach them to the body of the email as a MIME attachment making sure that the message and each attachment has a different id so that the receiving email client knows how to seperate the parts again.

My mayor problem is that i receive an empty file if i do that, i must be doing something wrong