SMTP Authentication problem

[eruth]

Hi all,

I'm trying to send an e-mail from a vb.net web form. I can create the
message, but when it comes to actually sending it I get the following
error. "Mailbox name not allowed. The server response was: Server
policy dictates you must authenticate first "

So far as I can tell, my code is doing what it's meant to, but I'd
appreciate someone casting an eye over it to make sure. This is based
on a couple of examples found through google.
<code>
Dim Message As MailMessage = New MailMessage()
Dim Smtp As New SmtpClient()
Dim SmtpUser As New System.Net.Netw orkCredential()
'-- Build Message
Message.From = New MailAddress("me @mydomain.co.uk ", "Me")
Message.To.Add( New MailAddress("yo *@mydomain.co.u k", "you"))
Message.IsBodyH tml = False
Message.Subject = "test"
Message.Body = "This is a test"
'-- Define Authenticated User
SmtpUser.UserNa me = "user"
SmtpUser.Passwo rd = "password"
SmtpUser.Domain = "mydomain.co.uk "
'-- Send Message
Smtp.UseDefault Credentials = False
Smtp.Credential s = SmtpUser
Smtp.Host = "mydomain.co.uk "
Smtp.Port = 25
Smtp.DeliveryMe thod = SmtpDeliveryMet hod.Network
Smtp.Send(Messa ge)
</code>

[Madhur]

The error message suggests that mydomain.co.uk is asking for SMTP
authentication.

Are you sure that particular SMTP can relay email messages without
authentication.

--
MAdhur

"eruth" <em***********@ gmail.comwrote in message
news:cf******** *************** ***********@34g 2000hsh.googleg roups.com...

Hi all,

I'm trying to send an e-mail from a vb.net web form. I can create the
message, but when it comes to actually sending it I get the following
error. "Mailbox name not allowed. The server response was: Server
policy dictates you must authenticate first "

So far as I can tell, my code is doing what it's meant to, but I'd
appreciate someone casting an eye over it to make sure. This is based
on a couple of examples found through google.
<code>
Dim Message As MailMessage = New MailMessage()
Dim Smtp As New SmtpClient()
Dim SmtpUser As New System.Net.Netw orkCredential()
'-- Build Message
Message.From = New MailAddress("me @mydomain.co.uk ", "Me")
Message.To.Add( New MailAddress("yo *@mydomain.co.u k", "you"))
Message.IsBodyH tml = False
Message.Subject = "test"
Message.Body = "This is a test"
'-- Define Authenticated User
SmtpUser.UserNa me = "user"
SmtpUser.Passwo rd = "password"
SmtpUser.Domain = "mydomain.co.uk "
'-- Send Message
Smtp.UseDefault Credentials = False
Smtp.Credential s = SmtpUser
Smtp.Host = "mydomain.co.uk "
Smtp.Port = 25
Smtp.DeliveryMe thod = SmtpDeliveryMet hod.Network
Smtp.Send(Messa ge)
</code>

[eruth]

If authentication is turned off, the mail can be sent, but as soon as
we turn it back on, I get that message.

On May 12, 7:08 pm, "Madhur" <[e-mail] te:

The error message suggests that mydomain.co.uk is asking for SMTP
authentication.

Are you sure that particular SMTP can relay email messages without
authentication.

--
MAdhur

"eruth" <emma.pearl...@ gmail.comwrote in message

news:cf******** *************** ***********@34g 2000hsh.googleg roups.com...

Hi all,

I'm trying to send an e-mail from a vb.net web form. I can create the
message, but when it comes to actually sending it I get the following
error. "Mailbox name not allowed. The server response was: Server
policy dictates you must authenticate first "

So far as I can tell, my code is doing what it's meant to, but I'd
appreciate someone casting an eye over it to make sure. This is based
on a couple of examples found through google.
<code>
Dim Message As MailMessage = New MailMessage()
Dim Smtp As New SmtpClient()
Dim SmtpUser As New System.Net.Netw orkCredential()
'-- Build Message
Message.From = New MailAddress("m. [e-mail]. uk", "Me")
Message.To.Add( New MailAddress("y. [e-mail]. uk", "you"))
Message.IsBodyH tml = False
Message.Subject = "test"
Message.Body = "This is a test"
'-- Define Authenticated User
SmtpUser.UserNa me = "user"
SmtpUser.Passwo rd = "password"
SmtpUser.Domain = "mydomain.co.uk "
'-- Send Message
Smtp.UseDefault Credentials = False
Smtp.Credential s = SmtpUser
Smtp.Host = "mydomain.co.uk "
Smtp.Port = 25
Smtp.DeliveryMe thod = SmtpDeliveryMet hod.Network
Smtp.Send(Messa ge)
</code>

[Madhur]

Check if your authentication requires some security encryption.

"eruth" <em***********@ gmail.comwrote in message
news:67******** *************** ***********@m73 g2000hsh.google groups.com...

If authentication is turned off, the mail can be sent, but as soon as
we turn it back on, I get that message.

On May 12, 7:08 pm, "Madhur" <[e-mail] te:

>The error message suggests that mydomain.co.uk is asking for SMTP
authentication .

Are you sure that particular SMTP can relay email messages without
authentication .

--
MAdhur

"eruth" <emma.pearl...@ gmail.comwrote in message

news:cf******* *************** ************@34 g2000hsh.google groups.com...

Hi all,

I'm trying to send an e-mail from a vb.net web form. I can create the
message, but when it comes to actually sending it I get the following
error. "Mailbox name not allowed. The server response was: Server
policy dictates you must authenticate first "

So far as I can tell, my code is doing what it's meant to, but I'd
appreciate someone casting an eye over it to make sure. This is based
on a couple of examples found through google.
<code>
Dim Message As MailMessage = New MailMessage()
Dim Smtp As New SmtpClient()
Dim SmtpUser As New System.Net.Netw orkCredential()
'-- Build Message
Message.From = New MailAddress("m. [e-mail]. uk", "Me")
Message.To.Add( New MailAddress("y. [e-mail]. uk", "you"))
Message.IsBodyH tml = False
Message.Subject = "test"
Message.Body = "This is a test"
'-- Define Authenticated User
SmtpUser.UserNa me = "user"
SmtpUser.Passwo rd = "password"
SmtpUser.Domain = "mydomain.co.uk "
'-- Send Message
Smtp.UseDefault Credentials = False
Smtp.Credential s = SmtpUser
Smtp.Host = "mydomain.co.uk "
Smtp.Port = 25
Smtp.DeliveryMe thod = SmtpDeliveryMet hod.Network
Smtp.Send(Messa ge)
</code>

[eruth]

On May 13, 1:36 pm, "Madhur" <[e-mail] te:

Check if your authentication requires some security encryption.

"eruth" <emma.pearl...@ gmail.comwrote in message

news:67******** *************** ***********@m73 g2000hsh.google groups.com...

If authentication is turned off, the mail can be sent, but as soon as
we turn it back on, I get that message.

On May 12, 7:08 pm, "Madhur" <[e-mail] te:

The error message suggests that mydomain.co.uk is asking for SMTP
authentication.

Are you sure that particular SMTP can relay email messages without
authentication.

--
MAdhur

"eruth" <emma.pearl...@ gmail.comwrote in message

>news:cf******* *************** ************@34 g2000hsh.google groups.com...

Hi all,

I'm trying to send an e-mail from a vb.net web form. I can create the
message, but when it comes to actually sending it I get the following
error. "Mailbox name not allowed. The server response was: Server
policy dictates you must authenticate first "

So far as I can tell, my code is doing what it's meant to, but I'd
appreciate someone casting an eye over it to make sure. This is based
on a couple of examples found through google.
<code>
Dim Message As MailMessage = New MailMessage()
Dim Smtp As New SmtpClient()
Dim SmtpUser As New System.Net.Netw orkCredential()
'-- Build Message
Message.From = New MailAddress("m. [e-mail]. uk", "Me")
Message.To.Add( New MailAddress("y. [e-mail]. uk", "you"))
Message.IsBodyH tml = False
Message.Subject = "test"
Message.Body = "This is a test"
'-- Define Authenticated User
SmtpUser.UserNa me = "user"
SmtpUser.Passwo rd = "password"
SmtpUser.Domain = "mydomain.co.uk "
'-- Send Message
Smtp.UseDefault Credentials = False
Smtp.Credential s = SmtpUser
Smtp.Host = "mydomain.co.uk "
Smtp.Port = 25
Smtp.DeliveryMe thod = SmtpDeliveryMet hod.Network
Smtp.Send(Messa ge)
</code>

Turns out all this was caused not by my code, but by the SMTP server
not being configured correctly. Nice to know it wasn't me though ;)