Programming Forums > Application Development > Visual Basic .NET

NightShade01 · Jul 7th, 2007, 8:17 PM

Hey everyone I just had a quick question. I just finished writing a very very simple mail client (litterally all it does is send msg's). I was wondering, sometimes when I send mail it goes really quick and appears almost instantly on the receiving server however sometimes it sends quickly and takes longer (about 45 secs) to appear on the server. I'm not complaining about the time it's not important just curious as to why it might do that. Any thoughts?

-Test it with different sized email which doesn't seem to have any impact on it.

lectricpharaoh · Jul 8th, 2007, 1:53 AM

Many things can account for this, including network conditions (takes the mail longer to arrive), server load (takes the server longer to process it), mail content (some servers may apply filters and/or virus scanning of attachments, either of which may slow processing), and any number of other things.

Infinite Recursion · Jul 8th, 2007, 10:18 AM

I agree with lectricpharaoh. There are a lot of moving parts involved in this process and any one of them could cause a delay.

mattireland · Jul 8th, 2007, 11:42 AM

Yeh, it's all pretty much been said. Please can you upload the source? I'd be really, really interested to see it as I've wanted to include mail in one of my programs! I'd give you credit for the small bit that I'd use it for and if it sweeps the nation like I'm hoping it would - we'd both be famous!

john Wesley · Jul 8th, 2007, 12:16 PM

mattireland, why dont you just read the documentation of the System.Net.Mail namespace and get the satisfaction of doing it yourself?

mattireland · Jul 8th, 2007, 12:20 PM

Right, now I know the namespace I will. That's all I really wanted. Thanks!

mattireland · Jul 8th, 2007, 1:10 PM

Hey guys! Sorry to invade this thread but why isn't this working?

(Toggle Plain Text)

    Dim sendto = "matt@mattireland.co.uk"

    Private Sub Send1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Send1.Click
        'create the mail message
        Dim mail As New Net.Mail.MailMessage()

        'set the addresses
        mail.From = New Net.Mail.MailAddress("program@program.com")
        mail.To.Add("matt@mattireland.co.uk")

        'set the content
        mail.Subject = "testing"
        mail.Body = "testing program"

        'send the message
        Dim smtp As New Net.Mail.SmtpClient("127.0.0.1")
        smtp.Send(mail)
        MsgBox("The message has been sent to: " & sendto)



    End Sub

I get an unhandled exception error and it says that the sending has failed. Thanks!

PhilBon · Jul 8th, 2007, 4:14 PM

is your mail server on? As well as does it need authentication? Are you sure you have everything you need?

john Wesley · Jul 8th, 2007, 4:45 PM

Yeah as PhilBon has just said, you would need to send mail through a mail server - if you dont have your own set-up you would generally send them via your mail provider's server.

Also, alot of servers wont just receive mail from anyone and again as PhilBon mentioned, you generally need to use an Ssl connection.

mattireland · Jul 8th, 2007, 5:19 PM

How do I set up the mail server? Sorry I'm a bit of a noob at this mail stuff still.

Thanks!

Jul 7th, 2007, 8:17 PM	#1
NightShade01 Programmer Join Date: Oct 2005 Posts: 52 Rep Power: 3	Mailing Program Hey everyone I just had a quick question. I just finished writing a very very simple mail client (litterally all it does is send msg's). I was wondering, sometimes when I send mail it goes really quick and appears almost instantly on the receiving server however sometimes it sends quickly and takes longer (about 45 secs) to appear on the server. I'm not complaining about the time it's not important just curious as to why it might do that. Any thoughts? -Test it with different sized email which doesn't seem to have any impact on it.

Jul 8th, 2007, 1:53 AM	#2
lectricpharaoh Caffeinated Neural Net Join Date: Jun 2005 Location: Dry west coast of Canada Posts: 1,005 Rep Power: 5	Many things can account for this, including network conditions (takes the mail longer to arrive), server load (takes the server longer to process it), mail content (some servers may apply filters and/or virus scanning of attachments, either of which may slow processing), and any number of other things. __________________ And once again, Probability proves itself willing to sneak into a back alley and service Drama as would a copper-piece harlot. - Vaarsuvius, Order of the Stick

Jul 8th, 2007, 10:18 AM	#3
Infinite Recursion Programming Guru Join Date: Jul 2004 Location: United States Posts: 3,467 Rep Power: 8	I agree with lectricpharaoh. There are a lot of moving parts involved in this process and any one of them could cause a delay. __________________ http://jasonpowers.net "There are a thousand hacking at the branches of evil to one who is striking at the root."

Jul 8th, 2007, 12:16 PM	#5
john Wesley Hobbyist Programmer Join Date: May 2006 Location: United Kingdom Posts: 119 Rep Power: 3	mattireland, why dont you just read the documentation of the System.Net.Mail namespace and get the satisfaction of doing it yourself? __________________ Mona Lisa must of had the highway blues you can tell by the way she smiles..

Jul 8th, 2007, 12:20 PM	#6
mattireland Hobbyist Programmer Join Date: Jul 2007 Location: Wales, United Kingdom Posts: 199 Rep Power: 2	Right, now I know the namespace I will. That's all I really wanted. Thanks! __________________ Matt Ireland http://www.mattireland.org matt@mattireland.co.uk

Jul 8th, 2007, 11:42 AM	#4
mattireland Hobbyist Programmer Join Date: Jul 2007 Location: Wales, United Kingdom Posts: 199 Rep Power: 2	Yeh, it's all pretty much been said. Please can you upload the source? I'd be really, really interested to see it as I've wanted to include mail in one of my programs! I'd give you credit for the small bit that I'd use it for and if it sweeps the nation like I'm hoping it would - we'd both be famous!

Jul 8th, 2007, 1:10 PM	#7
mattireland Hobbyist Programmer Join Date: Jul 2007 Location: Wales, United Kingdom Posts: 199 Rep Power: 2	Hey guys! Sorry to invade this thread but why isn't this working? (Toggle Plain Text) Dim sendto = "matt@mattireland.co.uk" Private Sub Send1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Send1.Click 'create the mail message Dim mail As New Net.Mail.MailMessage() 'set the addresses mail.From = New Net.Mail.MailAddress("program@program.com") mail.To.Add("matt@mattireland.co.uk") 'set the content mail.Subject = "testing" mail.Body = "testing program" 'send the message Dim smtp As New Net.Mail.SmtpClient("127.0.0.1") smtp.Send(mail) MsgBox("The message has been sent to: " & sendto) End Sub Dim sendto = "matt@mattireland.co.uk" Private Sub Send1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Send1.Click 'create the mail message Dim mail As New Net.Mail.MailMessage() 'set the addresses mail.From = New Net.Mail.MailAddress("program@program.com") mail.To.Add("matt@mattireland.co.uk") 'set the content mail.Subject = "testing" mail.Body = "testing program" 'send the message Dim smtp As New Net.Mail.SmtpClient("127.0.0.1") smtp.Send(mail) MsgBox("The message has been sent to: " & sendto) End Sub I get an unhandled exception error and it says that the sending has failed. Thanks! __________________ Matt Ireland http://www.mattireland.org matt@mattireland.co.uk

Jul 8th, 2007, 4:14 PM	#8
PhilBon Hobbyist Programmer Join Date: Nov 2005 Posts: 172 Rep Power: 3	is your mail server on? As well as does it need authentication? Are you sure you have everything you need?

Jul 8th, 2007, 4:45 PM	#9
john Wesley Hobbyist Programmer Join Date: May 2006 Location: United Kingdom Posts: 119 Rep Power: 3	Yeah as PhilBon has just said, you would need to send mail through a mail server - if you dont have your own set-up you would generally send them via your mail provider's server. Also, alot of servers wont just receive mail from anyone and again as PhilBon mentioned, you generally need to use an Ssl connection. __________________ Mona Lisa must of had the highway blues you can tell by the way she smiles..

Jul 8th, 2007, 5:19 PM	#10
mattireland Hobbyist Programmer Join Date: Jul 2007 Location: Wales, United Kingdom Posts: 199 Rep Power: 2	How do I set up the mail server? Sorry I'm a bit of a noob at this mail stuff still. Thanks! __________________ Matt Ireland http://www.mattireland.org matt@mattireland.co.uk

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Programming Forums > Application Development > Visual Basic .NET

Mailing Program