[RESOLVED] System.Web.Mail.MailMessage fails 1 in every 5 mails

From my application which is running on a win2003 server, I send mail using .System.Web.Mail.MailMessage:

Public Sub SendMail(ByVal FromText As String, _
ByVal sendToText As String, ByVal SubjectText As String, _
ByVal BodyText As String)
If sendToText.ToString.Trim.Length >= 0 And FromText.ToString.Trim.Length > 0 Then
myMessage = New MailMessage
System.Web.Mail.SmtpMail.SmtpServer = "xxx.com"
Try
With myMessage
.BodyFormat = MailFormat.Text
.Priority = MailPriority.Normal
.To = sendToText.ToString
.From = FromText.ToString
.Subject = SubjectText.ToString
.Body = BodyText.ToString
End With
System.Web.Mail.SmtpMail.Send(myMessage)
Catch ex As Exception
MsgBox(ex.Message, MsgBoxStyle.Information)

End Try


Now what happens is, that there is an irregular CDO error message. The first time I run it, 4 messages are being sent and on number 5 I get a "Could not access CDO.message object" error. Then I send another 5 messages in a row, and number 3 would fail, or number 1. So no pattern at all.

Anyone seen that behaviour before?

Quote:

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Originally Posted by PVR

From my application which is running on a win2003 server, I send mail using .System.Web.Mail.MailMessage:

Public Sub SendMail(ByVal FromText As String, _
ByVal sendToText As String, ByVal SubjectText As String, _
ByVal BodyText As String)
If sendToText.ToString.Trim.Length >= 0 And FromText.ToString.Trim.Length > 0 Then
myMessage = New MailMessage
System.Web.Mail.SmtpMail.SmtpServer = "xxx.com"
Try
With myMessage
.BodyFormat = MailFormat.Text
.Priority = MailPriority.Normal
.To = sendToText.ToString
.From = FromText.ToString
.Subject = SubjectText.ToString
.Body = BodyText.ToString
End With
System.Web.Mail.SmtpMail.Send(myMessage)
Catch ex As Exception
MsgBox(ex.Message, MsgBoxStyle.Information)

End Try


Now what happens is, that there is an irregular CDO error message. The first time I run it, 4 messages are being sent and on number 5 I get a "Could not access CDO.message object" error. Then I send another 5 messages in a row, and number 3 would fail, or number 1. So no pattern at all.

Anyone seen that behaviour before?

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could ur smtp server be blocking ur requests because ur trying to send to many at once?

For the sake of troubleshooting, add a small 3 second or 5 second timer to your loop and then try sending the emails out.

I just tried that, but no luck. On the second test, the mail even failed on the very first "send".

First test : have 30 seconds between the first and second mail : second mail failed
Second test: Failed on the first mail already

Is there a way of actually seeing what the SMTP server responded? I could not see a "proper" error in any of the debug values


Thanks for your help so far guys.

Ok - the way I solved it was as follows:

- I put a loop around the mailsend command which re-tries up to 5 times

Whenever it fails, it now will work on the second or third retry.

Thanks for your suggestions guys.