Would you use my .NET SMTP server class?

[chris128]

OK see the following link for a debug version that will output plenty of information to the Immediate Window (just using Debug.WriteLine) : http://www.cjwdev.co.uk/DeveloperCom...EBUG-BUILD.zip

When I use the code I posted a couple of posts back and run it with these debug versions of the DLLs, I see the following in my Immediate Window:

SendEmail method called, performing property/argument validation...
Property/argument validation complete
Starting loop through recipients...
Starting send for [email protected] ...
Checking recipient domain name is valid...
Recipient domain validation complete
Creating DnsClient instance (DNS server 192.168.0.254) ...
DnsClient instance created
Performing MX lookup for gmail.com ...
Sent MX record lookup for gmail.com
Sent A record lookup for alt3.gmail-smtp-in.l.google.com
Sent A record lookup for alt2.gmail-smtp-in.l.google.com
Sent A record lookup for alt1.gmail-smtp-in.l.google.com
Sent A record lookup for alt4.gmail-smtp-in.l.google.com
Sent A record lookup for gmail-smtp-in.l.google.com
MX lookup complete, 5 MX records found
Starting loop through MX records...
Starting loop through email server IP addresses in this record...
Initiating connection with remote SMTP server 209.85.220.29 on worker thread...
Checking to see if initial connection was successful...
Initial connection was successful, set wait signal and wait for this thread to be unblocked by the worker thread...
No previous SMTP command sent, sending EHLO command...
Last SMTP command sent: Ehlo
Last SMTP command sent: MailFrom
Last SMTP command sent: RcptTo
Last SMTP command sent: DataCommand
Last SMTP command sent: Data
No errors reported from server - classing message as being submitted successfully
Ending SMTP session for the following reason: MessageSubmittedSuccessfully
Unblocking original thread...
Worker thread unblocked original thread, checking session result
Loop through mail server IP addresses complete
Loop through MX records complete
Loop through recipients complete, returning result list to caller of SendEmail method

Can you try running it and post exactly what you get in the Immediate Window? Thanks

[cicatrix]

I suggest to mask e-mail addresses (unless you want another ton of spam)

[minitech]

I get no spam right now, so I feel very left out. Nothing in my Junk Mail/Spam folder either. I just don't get any. That's something I don't know anything about. I wish I would get some for a change.

[formlesstree4]

I ran the debug dll's and...nothing showed in the Immediate Window when I used them which makes no sense. I originally had the code on a Background Thread, so I moved it back and still got nothing.

If it helps, here's the code:

Public Class Form1
    Dim Smtp As New Cjwdev.Mail.SmtpSender()
    Dim WithEvents SendMail As New System.ComponentModel.BackgroundWorker
    Dim msg As String = String.Empty
    Dim FromEmail As String = String.Empty
    Dim Subject As String = String.Empty
    Dim ToEmail As String = String.Empty
    Dim thread As System.Threading.Thread
    Dim WithEvents timer As New System.Timers.Timer With {.Interval = 100, .AutoReset = True}
    Private Sub SendOut()
        Dim emailList As New List(Of String)
        emailList.Add(ToEmail)
        Try
            Smtp.SendEmail(FromEmail, emailList, Subject, msg)
        Catch ex As Exception
            MessageBox.Show(ex.ToString)
        End Try
    End Sub
    Private Sub SendBtn_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles SendBtn.Click
        If (FromEmailBox.Text <> String.Empty) AndAlso (ToFieldBox.Text <> String.Empty) AndAlso (SubjectBox.Text <> String.Empty) AndAlso (SendMessageBox.Text <> String.Empty) Then
            msg = SendMessageBox.Text
            FromEmail = FromEmailBox.Text
            Subject = SubjectBox.Text
            ToEmail = ToFieldBox.Text
 
            AnimationBar.Style = ProgressBarStyle.Marquee
            SendBtn.Enabled = False
            'thread = New Threading.Thread(AddressOf SendOut)
            'thread.IsBackground = True
            'thread.Start()
            Call SendOut()
            'timer.Enabled = True
        End If
    End Sub
    Private Delegate Sub d_EnableControls()
    Private Sub enableControls()
        SendBtn.Enabled = True
        AnimationBar.Style = ProgressBarStyle.Blocks
        timer.Enabled = False
    End Sub
    Private Sub timer_Elapsed(ByVal sender As Object, ByVal e As System.Timers.ElapsedEventArgs) Handles timer.Elapsed
        If Not thread.IsAlive Then
            Me.Invoke(New d_EnableControls(AddressOf enableControls))
        End If
    End Sub
End Class

You can see where I commented out a few things here and there to move it back to the UI thread.

[chris128]

Hmm that is odd... I'll rebuild the debug DLLs and have them just write to a text file rather than using Debug.WriteLine. I'll edit this post when I've uploaded the new ones.

EDIT: OK try downloading the files again (using the same link as I posted in the last post) and running it again. Its just set to write to a text file named DebugLog.txt in the directory that the program is running from, so if you are testing this from within VS then it will be in the Bin\Debug folder of your solution. Let me know how it goes
Also, Formlesstree - are you saying that when you tried to send an email it did the same as what minitech is seeing? Or were you just trying out the debug files and commenting on the debug logging not working but the email still actually sent ok?

[formlesstree4]

Did the same as Minitech, nothing happened.

EDIT: Downloaded the update..got this:

2/12/2010 5:29:09 PM	SendEmail method called, performing property/argument validation...
2/12/2010 5:29:09 PM	Property/argument validation complete
2/12/2010 5:29:09 PM	Starting loop through recipients...
2/12/2010 5:29:09 PM	Starting send for ***@yahoo.com ...
2/12/2010 5:29:09 PM	Checking recipient domain name is valid...
2/12/2010 5:29:09 PM	Recipient domain validation complete
2/12/2010 5:29:09 PM	Creating DnsClient instance (DNS server 10.0.0.1) ...
2/12/2010 5:29:09 PM	DnsClient instance created
2/12/2010 5:29:09 PM	Performing MX lookup for yahoo.com ...
2/12/2010 5:29:09 PM	MX lookup complete, 8 MX records found
2/12/2010 5:29:09 PM	Starting loop through MX records...
2/12/2010 5:29:09 PM	Starting loop through email server IP addresses in this record...
2/12/2010 5:29:09 PM	Initiating connection with remote SMTP server 67.195.168.31 on worker thread...
2/12/2010 5:29:30 PM	Checking to see if initial connection was successful...
2/12/2010 5:29:30 PM	Initial connection failed, moving on to next mail server IP (if there is one)
2/12/2010 5:29:30 PM	Loop through mail server IP addresses complete
2/12/2010 5:29:30 PM	Starting loop through email server IP addresses in this record...
2/12/2010 5:29:30 PM	Initiating connection with remote SMTP server 74.6.136.65 on worker thread...
2/12/2010 5:29:51 PM	Checking to see if initial connection was successful...
2/12/2010 5:29:51 PM	Initial connection failed, moving on to next mail server IP (if there is one)
2/12/2010 5:29:51 PM	Loop through mail server IP addresses complete
2/12/2010 5:29:51 PM	Starting loop through email server IP addresses in this record...
2/12/2010 5:29:51 PM	Initiating connection with remote SMTP server 206.190.54.127 on worker thread...
2/12/2010 5:30:12 PM	Checking to see if initial connection was successful...
2/12/2010 5:30:12 PM	Initial connection failed, moving on to next mail server IP (if there is one)
2/12/2010 5:30:12 PM	Loop through mail server IP addresses complete
2/12/2010 5:30:12 PM	Starting loop through email server IP addresses in this record...
2/12/2010 5:30:12 PM	Initiating connection with remote SMTP server 209.191.88.254 on worker thread...
2/12/2010 5:30:33 PM	Checking to see if initial connection was successful...
2/12/2010 5:30:33 PM	Initial connection failed, moving on to next mail server IP (if there is one)
2/12/2010 5:30:33 PM	Loop through mail server IP addresses complete
2/12/2010 5:30:33 PM	Starting loop through email server IP addresses in this record...
2/12/2010 5:30:33 PM	Initiating connection with remote SMTP server 67.195.168.230 on worker thread...
2/12/2010 5:30:54 PM	Checking to see if initial connection was successful...
2/12/2010 5:30:54 PM	Initial connection failed, moving on to next mail server IP (if there is one)
2/12/2010 5:30:54 PM	Loop through mail server IP addresses complete
2/12/2010 5:30:54 PM	Starting loop through email server IP addresses in this record...
2/12/2010 5:30:54 PM	Initiating connection with remote SMTP server 98.137.54.237 on worker thread...
2/12/2010 5:31:15 PM	Checking to see if initial connection was successful...
2/12/2010 5:31:15 PM	Initial connection failed, moving on to next mail server IP (if there is one)
2/12/2010 5:31:15 PM	Loop through mail server IP addresses complete
2/12/2010 5:31:15 PM	Starting loop through email server IP addresses in this record...
2/12/2010 5:31:15 PM	Initiating connection with remote SMTP server 98.137.54.238 on worker thread...
2/12/2010 5:31:36 PM	Checking to see if initial connection was successful...
2/12/2010 5:31:36 PM	Initial connection failed, moving on to next mail server IP (if there is one)
2/12/2010 5:31:36 PM	Loop through mail server IP addresses complete
2/12/2010 5:31:36 PM	Starting loop through email server IP addresses in this record...
2/12/2010 5:31:36 PM	Initiating connection with remote SMTP server 66.94.236.34 on worker thread...
2/12/2010 5:31:57 PM	Checking to see if initial connection was successful...
2/12/2010 5:31:57 PM	Initial connection failed, moving on to next mail server IP (if there is one)
2/12/2010 5:31:57 PM	Loop through mail server IP addresses complete
2/12/2010 5:31:57 PM	Loop through MX records complete
2/12/2010 5:31:57 PM	Loop through recipients complete, returning result list to caller of SendEmail method

Obviously I edited out the email address, but that's the log. Looks like Yahoo rejected me.

[minitech]

Ok, here we are. Infinite loop, there's a connection faliure to the only IP address so it loops back to it.

14/02/2010 7:52:20 AM	SendEmail method called, performing property/argument validation...
14/02/2010 7:52:20 AM	Property/argument validation complete
14/02/2010 7:52:20 AM	Starting loop through recipients...
14/02/2010 7:52:20 AM	Starting send for [email protected] ...
14/02/2010 7:52:20 AM	Checking recipient domain name is valid...
14/02/2010 7:52:20 AM	Recipient domain validation complete
14/02/2010 7:52:20 AM	Creating DnsClient instance (DNS server 64.59.160.13) ...
14/02/2010 7:52:20 AM	DnsClient instance created
14/02/2010 7:52:20 AM	Performing MX lookup for gmail.com ...
14/02/2010 7:52:20 AM	MX lookup complete, 5 MX records found
14/02/2010 7:52:20 AM	Starting loop through MX records...
14/02/2010 7:52:20 AM	Starting loop through email server IP addresses in this record...
14/02/2010 7:52:20 AM	Initiating connection with remote SMTP server 209.85.222.31 on worker thread...
14/02/2010 7:52:41 AM	Checking to see if initial connection was successful...
14/02/2010 7:52:41 AM	Initial connection failed, moving on to next mail server IP (if there is one)
14/02/2010 7:52:41 AM	Loop through mail server IP addresses complete
14/02/2010 7:52:41 AM	Starting loop through email server IP addresses in this record...
14/02/2010 7:52:41 AM	Initiating connection with remote SMTP server 209.85.211.45 on worker thread...
14/02/2010 7:53:02 AM	Checking to see if initial connection was successful...
14/02/2010 7:53:02 AM	Initial connection failed, moving on to next mail server IP (if there is one)
14/02/2010 7:53:02 AM	Loop through mail server IP addresses complete
14/02/2010 7:53:02 AM	Starting loop through email server IP addresses in this record...
14/02/2010 7:53:02 AM	Initiating connection with remote SMTP server 209.85.221.31 on worker thread...

[chris128]

Thats not an infinite loop - the first IP is 209.85.222.31 and the last IP (the one it gets stuck on) is 209.85.221.31

It looks like something is blocking your connection to any servers on port 25 - although this should not cause my code to hang, it should just fail to connect to each of them and then return... let me have another look at the code and i'll see if I can see why it would just stop there..

[chris128]

Obviously I edited out the email address, but that's the log. Looks like Yahoo rejected me.

That looks more like the connection is being blocked not Yahoo rejecting you because of your IP address - if the SMTP server rejects you then it usually at least allows you to connect and then gives you an error in the SMTP session stating why you have been rejected. So it looks like either a firewall on your PC is blocking outbound connections on port 25 or your router or ISP is blocking it.

[formlesstree4]

I can mess with my router to see if opening port 25 does any difference.

[chris128]

OK but usually routers are setup to allow all ports outbound, its just inbound that they usually block, so you shouldnt have to do anything... I guess its possible yours is blocking it outbound as well though. More likely to be a firewall or virus scanner on your PC though I would have thought (I know some versions of mcafee anti virus block port 25 to stop viruses sending mass spam mails from your PC).

Just do a quick test using telnet and see if you can telnet through on port 25 to any SMTP server that you KNOW accepts connections on port 25 and see what happens... e.g telnet smtp.live.com 25

[formlesstree4]

The connect failed.....what on earth does that mean? Is my ISP blocking me from doing it?

[chris128]

The connect failed.....what on earth does that mean? Is my ISP blocking me from doing it?

Its possible, or like I said a firewall/av on your PC or possibly your router

[formlesstree4]

PC has no firewall on, but let me try my router.

Just tried it...gonna see if my ISP blocks any ports.

[gep13]

Hey,

Who is your ISP? It might be worth asking the question to them directly.

Gary

[Negative0]

I host my own mail server at home. I have AT&T DSL and I had to explicitly ask for port 25 to be opened. It took a ten minute phone call when I started using them and it has been working fine ever since.

[formlesstree4]

So you gotta call them to get it open? I got the same ISP you do Negative.

[gep13]

Yeah, you will have to give them a call.

Gary

[chris128]

huh, our ISPs here in the UK must not be as bothered about stopping spam as I've never had to ask for any ports to be opened with any of my ISPs..

[Seraph]

maybe that's why most of the spamming bot people are found overseas?

[Slyke]

Wow, ths sounds really cool. I can't wait to see the finished product.

[gep13]

Hey,

This most recent post has reminded me about this thread...

How's things going Chris?

Gary

[chris128]

I havent done much with it recently to be honest as I've just had so much other stuff going on and it was taking up a lot of time. I did get it to successfully send some emails but I think some people on here encountered a few issues that I just never got chance to fully investigate. Might pick it back up soon but if anyone is really interested in the source code I guess I could make that available.

[motil]

I remember when you post somewhere long time ago that you started to work on that smtp server and that you'll probably fail doing so well, you prove yourself wrong, just wanted to say that this is really impressive

gj.

[chris128]

I remember when you post somewhere long time ago that you started to work on that smtp server and that you'll probably fail doing so well, you prove yourself wrong, just wanted to say that this is really impressive

gj.

Thanks yeah I looked back over the code I've got so far yesterday and I'm quite happy that I've got as far as I have with it, as it seemed such a daunting task once I had started it and realised how much work was involved. I'll definitely have to try and spend some more time on it soon..

[Emcrank]

How do you make a reference to your DLL?
Sorry for the noobish question :/

EDIT: doesn't matter, done it

[chris128]

Just go to the Project menu and then go to Add Reference, then click the Browse tab and browse to the DLL

[gep13]

How do you make a reference to your DLL?
Sorry for the noobish question :/

EDIT: doesn't matter, done it

Don't worry about asking "noobish" questions. Everyone has to start somewhere, and no one on this forum should "flame" you for doing so.

Gary

[chris128]

EDIT: doesn't matter, done it

Cool did you try using the class and if so did it all work or did you have any problems?

[Emcrank]

How do you acctually send an email. What email adress do you use?
I used the code you put at start

[chris128]

How could I possibly tell you what email address to use? You use whatever email address you want to send to and whatever email address you want it to come from. As you will notice from one of my blog posts and some earlier posts in this thread though, you may have problems sending to hotmail/gmail/yahoo addresses if you are a home broadband user (rather than a business) due to restrictions that these email providers place on their servers to help stop spam.

[Emcrank]

Noooo i meant, does the 'Sender' have to be one of my email addresses? or can i type anything in?
Also i was trying to send it to a gmail and hotmail so maybe thats why it wasn't reaching it in my inbox.

[chris128]

Yeah you can specify anything you want as the sender address, though some spam filters do check to see if the IP address that you have matches the IP address that is registered as the mail handler/server for the email domain you are sending from.
As for sending to hotmail and gmail, unfortunately there is nothing I can do to fix that as its out of my control see here for a proper explanation of the problem if you are interested: http://cjwdev.wordpress.com/2010/01/...ress-report-4/

[gep13]

As general point, spam email, and email spoofing, are big problems around the world, and not something that you should take part in!!! You should really only send email from domains/email address that you are in charge of, or own.

Gary

[Emcrank]

Post #113: oh i guess its not much use then . O well.

Post #114: I wasn't sending it to anyone else. I was sending an email to myself when my program got opened