Sending Email via VB.Net

[Ed Bitzer]

I have just written a utility (with help from this forum) to
automatically send a sign-up sheet to a dozen tennis friends using
Smtp.Send() from the System.Web.Mail namespace. I question that this
message goes through my ISP's SMTP server (Comcast) since I have not
identified that server or provided a password as required in my set up
of OE or Thunderbird. From what I read it does it's own DNS lookup for
each of the addresses. Is this ok with ISPs?

Ed

[Patrice Scribe]

AFAIK unless you explicitely configured something in your code, it is
likeley it uses the local SMTP server. Do you have a local SMTP server (it
is part of the IIS setup) ?

Patrice
"Ed Bitzer" <ed******@yahoo .coma écrit dans le message de news:
u6************* *@TK2MSFTNGP02. phx.gbl...

>I have just written a utility (with help from this forum) to automatically
send a sign-up sheet to a dozen tennis friends using Smtp.Send() from the
System.Web.Mai l namespace. I question that this message goes through my
ISP's SMTP server (Comcast) since I have not identified that server or
provided a password as required in my set up of OE or Thunderbird. From
what I read it does it's own DNS lookup for each of the addresses. Is this
ok with ISPs?

Ed

[Cor Ligthert [MVP]]

A little addition to Partice message

On professional or Server Windows OS.

By instance not on Me and XP home.

Cor

"Patrice Scribe" <http://www.chez.com/scribe/schreef in bericht
news:OE******** ******@TK2MSFTN GP04.phx.gbl...

AFAIK unless you explicitely configured something in your code, it is
likeley it uses the local SMTP server. Do you have a local SMTP server (it
is part of the IIS setup) ?

Patrice
"Ed Bitzer" <ed******@yahoo .coma écrit dans le message de news:
u6************* *@TK2MSFTNGP02. phx.gbl...

>>I have just written a utility (with help from this forum) to automatically
send a sign-up sheet to a dozen tennis friends using Smtp.Send() from the
System.Web.Ma il namespace. I question that this message goes through my
ISP's SMTP server (Comcast) since I have not identified that server or
provided a password as required in my set up of OE or Thunderbird. From
what I read it does it's own DNS lookup for each of the addresses. Is this
ok with ISPs?

Ed

[Ed Bitzer]

"Cor Ligthert [MVP]" <no************ @planet.nlwrote in message
news:Oc******** *****@TK2MSFTNG P06.phx.gbl...

>A little addition to Partice message

On professional or Server Windows OS.

By instance not on Me and XP home.

Cor

"Patrice Scribe" <http://www.chez.com/scribe/schreef in bericht
news:OE******** ******@TK2MSFTN GP04.phx.gbl...

>AFAIK unless you explicitely configured something in your code, it
is likeley it uses the local SMTP server. Do you have a local SMTP
server (it is part of the IIS setup) ?

Patrice
"Ed Bitzer" <ed******@yahoo .coma écrit dans le message de news:
u6************ **@TK2MSFTNGP02 .phx.gbl...

>>>I have just written a utility (with help from this forum) to
automaticall y send a sign-up sheet to a dozen tennis friends using
Smtp.Send( ) from the System.Web.Mail namespace. I question that
this message goes through my ISP's SMTP server (Comcast) since I
have not identified that server or provided a password as required
in my set up of OE or Thunderbird. From what I read it does it's
own DNS lookup for each of the addresses. Is this ok with ISPs?

Ed

Cor and Patrice,
I was delinquent in providing full detail. I am running XP-Home and
no IIS. I have provided no username, password or SMTP server
identification (i.e. smtp.comcast.co m). Simply state Smtp.Send(my
address, to addresses, subject and message) in the Form load and after
a timer delay to be sure it sends, Application.Exi t, and it is working
great. I'll run the exe from a scheduler each week

Ed

[Stephany Young]

Hmmmmm ... Smtp.Send ????

Would be interesting to see your code and relevant portions of your
configuration files.
"Ed Bitzer" <ed******@yahoo .comwrote in message
news:ub******** ******@TK2MSFTN GP03.phx.gbl...

>
"Cor Ligthert [MVP]" <no************ @planet.nlwrote in message
news:Oc******** *****@TK2MSFTNG P06.phx.gbl...

>>A little addition to Partice message

On professional or Server Windows OS.

By instance not on Me and XP home.

Cor

"Patrice Scribe" <http://www.chez.com/scribe/schreef in bericht
news:OE******* *******@TK2MSFT NGP04.phx.gbl.. .

>>AFAIK unless you explicitely configured something in your code, it is
likeley it uses the local SMTP server. Do you have a local SMTP server
(it is part of the IIS setup) ?

Patrice
"Ed Bitzer" <ed******@yahoo .coma écrit dans le message de news:
u6*********** ***@TK2MSFTNGP0 2.phx.gbl...
I have just written a utility (with help from this forum) to
automatical ly send a sign-up sheet to a dozen tennis friends using
Smtp.Send () from the System.Web.Mail namespace. I question that this
message goes through my ISP's SMTP server (Comcast) since I have not
identifie d that server or provided a password as required in my set up
of OE or Thunderbird. From what I read it does it's own DNS lookup for
each of the addresses. Is this ok with ISPs?

Ed

Cor and Patrice,
I was delinquent in providing full detail. I am running XP-Home and no
IIS. I have provided no username, password or SMTP server identification
(i.e. smtp.comcast.co m). Simply state Smtp.Send(my address, to addresses,
subject and message) in the Form load and after a timer delay to be sure
it sends, Application.Exi t, and it is working great. I'll run the exe
from a scheduler each week

Ed

[Rick]

I am with Stephanie in wanting to see your code.

I have a local IIS server running from a terminal server and send various
emails to clients. With Comcast in particular, I always fail with the local
SMTP server since Comcast bounces the message back saying that it needs to
have a reverse DNS entry available to authenticate the mail source (or
somehting like this message). With a privately addressed SMTP server this
is not possible.

Please let us know how you are doing this.

Rick

[Lucvdv]

On Thu, 21 Dec 2006 17:05:45 -0500, "Ed Bitzer" <ed******@yahoo .comwrote:

Cor and Patrice,
I was delinquent in providing full detail. I am running XP-Home and
no IIS. I have provided no username, password or SMTP server
identification (i.e. smtp.comcast.co m). Simply state Smtp.Send(my
address, to addresses, subject and message) in the Form load and after
a timer delay to be sure it sends, Application.Exi t, and it is working
great. I'll run the exe from a scheduler each week

I concur with the others: I'd like to see that code.

These two lines in VB.Net:

Dim sx As New SmtpClient
sx.Send("ad@sni pped.invalid", "[e-mail] alid", "Test", "Test")

cause an exception

"The SMTP host was not specified."

My idea of what that means is that you (or someone) must have specified a
mailserver somewhere, or you'd have run into the same exception.
That doesn't necessary have to be in your code: the SMTP server can also be
specified in the .Net application or machine configuration file.

But now I'm beginning to wonder: it isn't done often AFAIK, but the SMTP
server can also be passed as a DHCP option (option 069) when your PC
receives its IP address. What I don't know is if Windows/.Net CLR would
use it as default if your network admin had set it up that way.

As for username and password, that's another matter: you normally don't
need those to send mail, only to retrieve mail from a POP account.

SMTP is in essence an authenticationl ess protocol, it will accept mail from
anybody (which is why there's so much spam going around, which in turn is
the reason why they started building in restrictions, but that story is too
long for this message).

This version works (here, for me, if I replace the addresses by real ones):

Dim sx As New SmtpClient
sx.Host = "10.1.0.5"
sx.Send("ad@sni pped.invalid", "[e-mail] alid", "Test", "Test")

[Ed Bitzer]

The code is brief,
Imports System.Web.Mail
and in the Form1_Load
SmtpMail.Send(" my*******@comca st.net", strAddressList, strSubject,
strEmailMsg)

where strAddressList is in the form aname <us******@xyc.c om>;
anothername <us******@abc.c om>
strSubject is "my subject"
strEmailMsg is "my message"

I have successfully sent messages to my Comcast addresses, my Yahoo
address and to a Verizon customer.

My ISP is Comcast and I am connected via a router (I have two
computers) to the modem. I am running XP-Home (fully updated) and
VB.Net Framework 1.1 and the Microsoft Visual Basic.NET (Standard)
2003

I obviously am not feeding you guys enough detail so you will have to
ask specifically.

I did catch Lucdvc's point that username and password are only
necessary for receiving mail. I do however in OE specify the SMTP
server (smtp.comcast.n et) where I have not done that here.

Ed

[ShaneO]

Lucvdv wrote:

>
As for username and password, that's another matter: you normally don't
need those to send mail, only to retrieve mail from a POP account.

SMTP is in essence an authenticationl ess protocol, it will accept mail from
anybody (which is why there's so much spam going around, which in turn is
the reason why they started building in restrictions, but that story is too
long for this message).

In Australia, just about all ISP's are now stopping SMTP without
authenticating first. To this end, the following is typically what I'm
using in my applications -

Dim SMTPClient As New SmtpClient(sSMT P_Server, iSMTP_Port)
SMTPClient.Cred entials = New Net.NetworkCred ential(sAccName , sAccPW)
Dim SMTPMessage As New MailMessage(sEm ailFROM, sEmailTo, sEmailSubject,
sEmailMessageBo dy)
If Not String.IsNullOr Empty(sFileAtta chment) Then
Dim EmailAttachment As New Attachment(sFil eAttachment)
SMTPMessage.Att achments.Add(Em ailAttachment)
End If
SMTPClient.Send (SMTPMessage)

Obviously the above code isn't showing error traps etc., but I trust
this helps the OP.

ShaneO

There are 10 kinds of people - Those who understand Binary and those who
don't.

[=?Utf-8?B?RGVubmlz?=]

Very much appreciate your sharing code. I have not yet been successful at
sending e-mail with smtp. What are the following parameters?

sSMTP_Server, iSMTP_Port

Also, do you have IIs installed? Not sure if I have to have this installed.
--
Dennis in Houston
"ShaneO" wrote:

Lucvdv wrote:

As for username and password, that's another matter: you normally don't
need those to send mail, only to retrieve mail from a POP account.

SMTP is in essence an authenticationl ess protocol, it will accept mail from
anybody (which is why there's so much spam going around, which in turn is
the reason why they started building in restrictions, but that story is too
long for this message).

In Australia, just about all ISP's are now stopping SMTP without
authenticating first. To this end, the following is typically what I'm
using in my applications -

Dim SMTPClient As New SmtpClient(sSMT P_Server, iSMTP_Port)
SMTPClient.Cred entials = New Net.NetworkCred ential(sAccName , sAccPW)
Dim SMTPMessage As New MailMessage(sEm ailFROM, sEmailTo, sEmailSubject,
sEmailMessageBo dy)
If Not String.IsNullOr Empty(sFileAtta chment) Then
Dim EmailAttachment As New Attachment(sFil eAttachment)
SMTPMessage.Att achments.Add(Em ailAttachment)
End If
SMTPClient.Send (SMTPMessage)

Obviously the above code isn't showing error traps etc., but I trust
this helps the OP.

ShaneO

There are 10 kinds of people - Those who understand Binary and those who
don't.