Hello,
I’ve a problem when sending email with the new library version (6.2.0.0). With the 5.3.0.0 version of Aspose.Email this code works fine:
Public Overridable Function SMTPSend(ByVal smtpServer As String, port As Integer, timeout As Integer, subject As String, sender As String, to As String,
body As String, ByVal userName As String, ByVal password As String) As Integer
Dim _smtp As SmtpClient = Nothing
Try
Dim mess As New MailMessage()
mess.From = sender
mess.To.Add(to.Trim)
mess.Subject = subject.Replace(vbCr, " ").Replace(vbLf, " ")
If body.Trim <> “” Then mess.HtmlBody = body
mess.Headers.Remove(“X-Unsent”)
Try
_smtp = New SmtpClient
If String.IsNullOrEmpty(userName) Then
With _smtp
.UseAuthentication = False
End With
Else
With _smtp
.Username = userName
.Password = password
.UseAuthentication = True
End With
End If
If timeout > 0 Then
_smtp.ConnectionTimeout = timeout * 1000
_smtp.Timeout = timeout * 1000
Else
_smtp.ConnectionTimeout = Integer.MaxValue
_smtp.Timeout = Integer.MaxValue
End If
_smtp.Host = smtpServer
_smtp.Port = port
_smtp.DeliveryMethod = SmtpDeliveryMethod.Network
_smtp.SecurityOptions = SecurityOptions.Auto
_smtp.AuthenticationMethod = SmtpAuthentication.Auto
_smtp.Send(mess)
Return 1
Catch ex As Exception
Me.txtLog.Text += ex.ToString + Environment.NewLine
Return -1
End Try
Return 0
Finally
If Not _smtp Is Nothing Then
_smtp.Dispose()
_smtp = Nothing
End If
End Try
End Function
With the 6.2.0.0 version of the library I obtain this error:
Failure sending mail. —> System.IO.IOException: NameResolutionFailure
I have also configured the SMTP client activity logging, but I cannot find any logs. I think the error occurs first and then the library can’t connect to the SMTP server.
I have this error only in some customer installation, when they use ip for the SMTP server (ad example 10.0.0.2) . In addition, SMTP is configured with anonymous authentication, and so username and password are always empty.
With the server name all works fine, however for some customers there are special network configurations and so we are obliged to use IP addresses. Can I change any parameter of the library and return to make things work like in the old version?
Thanks.