Email Sending 5.1.1 error

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VB

Dim mSmtpClient As New SmtpClient(S_Smtp, S_port)
            Dim mMailmessage As New MailMessage
 
            Try
                mSmtpClient.Credentials = New System.Net.NetworkCredential(S_User, S_pass)
               
                mMailmessage.ReplyToList.Add(New MailAddress(S_replyto))
              
                mMailmessage.From = New MailAddress(sender & "<" & S_User & ">")
                mMailmessage.Subject = subject
 
                Dim Overallmail As Integer = str.Rows.Count
               
 
                   
                    
   '-------------------start Sending---------------------------------------------------------
                    For i = 0 To str.Rows.Count - 1
 
   
                            Dim bodymail As String = body
                            email = str.Rows(i).Item(0).ToString
 
                    bodymail = bodymail.Replace(oldmail, email).Replace("[email]", email)
                    htmlView = System.Net.Mail.AlternateView.CreateAlternateViewFromString(bodymail, Nothing, "text/html")
 
                    'mSmtpClient.DeliveryMethod = SmtpDeliveryMethod.Network

                                mMailmessage.AlternateViews.Add(htmlView)
                                mMailmessage.IsBodyHtml = True
                                'execute too fast to see the thread working.  
                                mMailmessage.[To].Add(New MailAddress(email))
 
                                '''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''

                                mSmtpClient.Send(mMailmessage)
 
                                '''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''

                                mMailmessage.To.Clear()
                                mMailmessage.AlternateViews.Clear()
 
                             
 
                                Thread.Sleep(oXMLparams.GetParamValue("EmailEvery"))
 
                            End If

This method is returning an error which is :The server response was: 5.1.1 : Recipient address rejected: User unknown in virtual mailbox table

i think one of the emails that im sending to is not valid but its syntax is true

what could i add to the sending method to ignore this kind of mails and set it as bounce and not to stop the sending process

thanks

Posted 12-Jan-14 23:36pm

Hidhoud1991

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Bojjaiah · Answer 1 · 2014-01-13T00:23:00

Solution 1

Email Sending[^]

Posted 13-Jan-14 0:23am

Bojjaiah

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Hidhoud1991 13-Jan-14 7:14am

The sending method i wrote is correct but the error that is thrown is stopping the method i need to put try catch with the errors that i may face but i dont know these errors

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) · Answer 2 · 2014-01-13T01:24:00

If you look at Understanding Email Errors[^]

Quote:
Permanent Problems

The most common permanent user problem is, of course, User Unknown. The account you are trying to mail no longer exists - it may have been shut down, or you may have misspelled the username or domain (make sure you check email error messages carefully). The following are all examples of User Unknown messages:
<user@earthlink.net>: host condor.prod.itd.earthlink.net said:
550 <user@earthlink.net>... User unknown

<user@hotmail.com>: host mail7.hotmail.com said:
550 Requested action not taken: mailbox unavailable

<user@apc.net>: host mail.apc.net said:
550 5.1.1 <user@apc.net> is not a valid mailbox

<user@riviera.org.uk>: Sorry, no mailbox here by that name. (#5.1.1)

<user@saccny.org>: host hhh.net said:
550 Invalid recipient <user@saccny.org>

The message that you sent was undeliverable to the following:
user@ashrosary.org (user not found)
If you receive a user unknown bounce, and you have checked to make sure the address is correct, the next thing you should do is try to contact the person you were trying to email by other means. Frequently, people are not aware that they are bouncing email until someone else tells them. Also, do not delete the bounce message. It can help the user and their ISP resolve why they are bouncing mail more quickly.

If you do not have other means to contact the person who is bouncing mail, you probably have a dead email address. Try mailing them one more time (preferably at least a day later) in case it was a technical problem, but after that, stop using that email address. If you run a mailing list, and one of your subscribers starts bouncing mail with this error, remove them from the list.

, then you would probably think that it recipient's fault, not your's. :)

Also take a look at reason: 550 5.1.1 : Recipient address rejected: User unknown in virtual mailbox table[^].