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sending e-mail from .Net app with MS exchange server

P: n/a

Hi does someone has experience with this ??

i have made a lot of apps in the past that were capable of sending e-mails
the server i then talked to was a Linux SMTP server and it worked great

Now i work in a company with a MS exchange server and would like to send
some e-mails however i can`t get it to work at all

error is : ( translated form the dutch language )

can`t connect as the target computer actively refused the connection

Strange as i am on the same domain as the exchange server and use windows
authentication to the server ( .Net 2.0 ) with outlook i can send e-mails
without anny problems ( and i can ping the exchange server )

does something has to be done at the MS exchange side or am i missing
something ???
regards

Michel Posseth


Jul 24 '06 #1
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8 Replies


P: n/a
Michel,

The exchange server does nothing excluding that you want to sent in the name
of somebody.

If you just want to use smtp than you can have a look at that website for
that.
http://www.systemwebmail.net/
(there is a special method that let you use the exchange server, have a
search yourself for that)

If you want to use it in the name of somebody, than you have to use mapi, be
aware that the last in my expirience was slow (but it is a long time ago
that I did that).
http://msdn.microsoft.com/library/de...chsvr_mapi.asp

However probably is this more that you are looking for.
http://msdn.microsoft.com/library/de...OtlkLOBCRM.asp

Cor

"Michel Posseth [MCP]" <Mi**************@discussions.microsoft.comschre ef
in bericht news:BD**********************************@microsof t.com...
>
Hi does someone has experience with this ??

i have made a lot of apps in the past that were capable of sending e-mails
the server i then talked to was a Linux SMTP server and it worked great

Now i work in a company with a MS exchange server and would like to send
some e-mails however i can`t get it to work at all

error is : ( translated form the dutch language )

can`t connect as the target computer actively refused the connection

Strange as i am on the same domain as the exchange server and use windows
authentication to the server ( .Net 2.0 ) with outlook i can send e-mails
without anny problems ( and i can ping the exchange server )

does something has to be done at the MS exchange side or am i missing
something ???
regards

Michel Posseth


Jul 24 '06 #2

P: n/a
Hello Cor ,,,
Well if what i read and find sofar in online resources is true that i would
be really dissapointed
If you just want to use smtp than you can have a look at that website for
that.
http://www.systemwebmail.net/
(there is a special method that let you use the exchange server, have a
search yourself for that)
I had found this website also through google however i did not find anny
code , example or article how to send e-mail through an exchange server .

The technet website however states that Exchange is fully SMTP capable
I try to send e-mails at this moment from my development computer loged in
under my own name ( windows authentication to exchange ) so i am not doing
annything odd that might interfere with the login credentials

my Dissaqpointment lies in the fact that in my previous work environment we
used a Linux mail server and everything worked as expected now with exchange
in a domain environment i can`t send anny e-mails with the .Net built in
methods


regards

Michel


"Cor Ligthert [MVP]" wrote:
Michel,

The exchange server does nothing excluding that you want to sent in the name
of somebody.

If you just want to use smtp than you can have a look at that website for
that.
http://www.systemwebmail.net/
(there is a special method that let you use the exchange server, have a
search yourself for that)

If you want to use it in the name of somebody, than you have to use mapi, be
aware that the last in my expirience was slow (but it is a long time ago
that I did that).
http://msdn.microsoft.com/library/de...chsvr_mapi.asp

However probably is this more that you are looking for.
http://msdn.microsoft.com/library/de...OtlkLOBCRM.asp

Cor

"Michel Posseth [MCP]" <Mi**************@discussions.microsoft.comschre ef
in bericht news:BD**********************************@microsof t.com...

Hi does someone has experience with this ??

i have made a lot of apps in the past that were capable of sending e-mails
the server i then talked to was a Linux SMTP server and it worked great

Now i work in a company with a MS exchange server and would like to send
some e-mails however i can`t get it to work at all

error is : ( translated form the dutch language )

can`t connect as the target computer actively refused the connection

Strange as i am on the same domain as the exchange server and use windows
authentication to the server ( .Net 2.0 ) with outlook i can send e-mails
without anny problems ( and i can ping the exchange server )

does something has to be done at the MS exchange side or am i missing
something ???
regards

Michel Posseth




Jul 24 '06 #3

P: n/a
Michel,

I think that you are right I never saw a real clean solution for this in the
newsgroups. And my last strugles with Exchange server was using the Mapi,
but that is very basic. I could see the mails going out one by one.

I thought that Jay has some years ago written something about this.

I see Jay not anymore active in this newsgroup a while, therefore I would
place it in the newsgroup languages as well. With the same topic but that
exchange/outlook server.

Cor

"Michel Posseth [MCP]" <Mi**************@discussions.microsoft.comschre ef
in bericht news:13**********************************@microsof t.com...
Hello Cor ,,,
Well if what i read and find sofar in online resources is true that i
would
be really dissapointed
>If you just want to use smtp than you can have a look at that website
for
that.
http://www.systemwebmail.net/
(there is a special method that let you use the exchange server, have a
search yourself for that)

I had found this website also through google however i did not find anny
code , example or article how to send e-mail through an exchange server .

The technet website however states that Exchange is fully SMTP capable
I try to send e-mails at this moment from my development computer loged in
under my own name ( windows authentication to exchange ) so i am not
doing
annything odd that might interfere with the login credentials

my Dissaqpointment lies in the fact that in my previous work environment
we
used a Linux mail server and everything worked as expected now with
exchange
in a domain environment i can`t send anny e-mails with the .Net built in
methods


regards

Michel


"Cor Ligthert [MVP]" wrote:
>Michel,

The exchange server does nothing excluding that you want to sent in the
name
of somebody.

If you just want to use smtp than you can have a look at that website
for
that.
http://www.systemwebmail.net/
(there is a special method that let you use the exchange server, have a
search yourself for that)

If you want to use it in the name of somebody, than you have to use mapi,
be
aware that the last in my expirience was slow (but it is a long time ago
that I did that).
http://msdn.microsoft.com/library/de...chsvr_mapi.asp

However probably is this more that you are looking for.
http://msdn.microsoft.com/library/de...OtlkLOBCRM.asp

Cor

"Michel Posseth [MCP]" <Mi**************@discussions.microsoft.com>
schreef
in bericht news:BD**********************************@microsof t.com...
>
Hi does someone has experience with this ??

i have made a lot of apps in the past that were capable of sending
e-mails
the server i then talked to was a Linux SMTP server and it worked great

Now i work in a company with a MS exchange server and would like to
send
some e-mails however i can`t get it to work at all

error is : ( translated form the dutch language )

can`t connect as the target computer actively refused the connection

Strange as i am on the same domain as the exchange server and use
windows
authentication to the server ( .Net 2.0 ) with outlook i can send
e-mails
without anny problems ( and i can ping the exchange server )

does something has to be done at the MS exchange side or am i missing
something ???
regards

Michel Posseth




Jul 24 '06 #4

P: n/a
Michel Posseth [MCP] wrote:
Hi does someone has experience with this ??

i have made a lot of apps in the past that were capable of sending e-mails
the server i then talked to was a Linux SMTP server and it worked great

Now i work in a company with a MS exchange server and would like to send
some e-mails however i can`t get it to work at all

error is : ( translated form the dutch language )

can`t connect as the target computer actively refused the connection
....
This means that Exchange server is not listening on port 25 (SMTP). It
may not be configured to provide SMTP or may use different port.

From the command line, type:
telnet serverip 25

if you don't get welcome message, .NET will not be able to send email
for sure.

Regards,
Goran

Jul 24 '06 #5

P: n/a
Hello Goran,,
Thank you verry much ,,, indeed it turned out that the exchange server was
not configured for SMTP at all even better it was closed on purpose
turned out , they have a seperate SMTP relay server on the intranet ( wich
in his turn comunicates to the exchange server ) .

Next time i wil talk sooner to one of the Tech guys , when my prooved code
is not working on this intranet :-)
i told the problem and one of them said inmediatly yes you need to use
another server to do that :-( aarghh

But i still think that it is strange that you can`t comunicate directly to
exchange server in it`s native format , cause outlook can so why can`t we
??

regards

And thanks to both of you , Goran and Cor for helping me out



"Goran Sliskovic" <gs******@yahoo.comschreef in bericht
news:%2***************@TK2MSFTNGP02.phx.gbl...
Michel Posseth [MCP] wrote:
>Hi does someone has experience with this ?? i have made a lot of apps in
the past that were capable of sending e-mails the server i then talked to
was a Linux SMTP server and it worked great Now i work in a company with
a MS exchange server and would like to send some e-mails however i can`t
get it to work at all error is : ( translated form the dutch language )
can`t connect as the target computer actively refused the connection
...
This means that Exchange server is not listening on port 25 (SMTP). It may
not be configured to provide SMTP or may use different port.

From the command line, type:
telnet serverip 25

if you don't get welcome message, .NET will not be able to send email for
sure.

Regards,
Goran

Jul 24 '06 #6

P: n/a
Michel Posseth [MCP] wrote:
Hello Goran,,
Thank you verry much ,,, indeed it turned out that the exchange server was
not configured for SMTP at all even better it was closed on purpose
turned out , they have a seperate SMTP relay server on the intranet ( wich
in his turn comunicates to the exchange server ) .

Next time i wil talk sooner to one of the Tech guys , when my prooved code
is not working on this intranet :-)
i told the problem and one of them said inmediatly yes you need to use
another server to do that :-( aarghh

But i still think that it is strange that you can`t comunicate directly to
exchange server in it`s native format , cause outlook can so why can`t we
??
....

Hi,
Outlook probably uses MAPI, which is different protocol. You were trying
to send email over SMTP which Exchange server was not configured to use.

Regards,
Goran
Jul 24 '06 #7

P: n/a

Yes i understand that,,,, however isn`t it strange that MS did not add a
Mapi or whatever protocol is used class to the .Net framework to talk to
exchange ??
i can only find an unmanaged MAPI ocx that was already used i.c.w. VB6

another option i found was interop with outlook and so send your e-mails
wich is not suitable for my purposes as not all of the target comps have
outlook installed ( servers ) so ,,,,,,

regards

Michel

"Goran Sliskovic" <gs******@yahoo.comschreef in bericht
news:Ox**************@TK2MSFTNGP02.phx.gbl...
Michel Posseth [MCP] wrote:
>Hello Goran,,
Thank you verry much ,,, indeed it turned out that the exchange server
was not configured for SMTP at all even better it was closed on purpose
turned out , they have a seperate SMTP relay server on the intranet (
wich in his turn comunicates to the exchange server ) .

Next time i wil talk sooner to one of the Tech guys , when my prooved
code is not working on this intranet :-)
i told the problem and one of them said inmediatly yes you need to use
another server to do that :-( aarghh

But i still think that it is strange that you can`t comunicate directly
to exchange server in it`s native format , cause outlook can so why
can`t we ??
...

Hi,
Outlook probably uses MAPI, which is different protocol. You were trying
to send email over SMTP which Exchange server was not configured to use.

Regards,
Goran

Jul 25 '06 #8

P: n/a
You can send SMTP mail messages to an Exchange server. However, you usually
have to specify the authentication credentials in the outbound mail.

The systemwebmail.net site has examples of adding credentials to your mail
header.

--
--- Nick Malik [Microsoft]
MCSD, CFPS, Certified Scrummaster
http://blogs.msdn.com/nickmalik

Disclaimer: Opinions expressed in this forum are my own, and not
representative of my employer.
I do not answer questions on behalf of my employer. I'm just a
programmer helping programmers.
--
"Michel Posseth [MCP]" <Mi**************@discussions.microsoft.comwrote in
message news:13**********************************@microsof t.com...
Hello Cor ,,,
Well if what i read and find sofar in online resources is true that i
would
be really dissapointed
>If you just want to use smtp than you can have a look at that website
for
that.
http://www.systemwebmail.net/
(there is a special method that let you use the exchange server, have a
search yourself for that)

I had found this website also through google however i did not find anny
code , example or article how to send e-mail through an exchange server .

The technet website however states that Exchange is fully SMTP capable
I try to send e-mails at this moment from my development computer loged in
under my own name ( windows authentication to exchange ) so i am not
doing
annything odd that might interfere with the login credentials

my Dissaqpointment lies in the fact that in my previous work environment
we
used a Linux mail server and everything worked as expected now with
exchange
in a domain environment i can`t send anny e-mails with the .Net built in
methods


regards

Michel


"Cor Ligthert [MVP]" wrote:
>Michel,

The exchange server does nothing excluding that you want to sent in the
name
of somebody.

If you just want to use smtp than you can have a look at that website
for
that.
http://www.systemwebmail.net/
(there is a special method that let you use the exchange server, have a
search yourself for that)

If you want to use it in the name of somebody, than you have to use mapi,
be
aware that the last in my expirience was slow (but it is a long time ago
that I did that).
http://msdn.microsoft.com/library/de...chsvr_mapi.asp

However probably is this more that you are looking for.
http://msdn.microsoft.com/library/de...OtlkLOBCRM.asp

Cor

"Michel Posseth [MCP]" <Mi**************@discussions.microsoft.com>
schreef
in bericht news:BD**********************************@microsof t.com...
>
Hi does someone has experience with this ??

i have made a lot of apps in the past that were capable of sending
e-mails
the server i then talked to was a Linux SMTP server and it worked great

Now i work in a company with a MS exchange server and would like to
send
some e-mails however i can`t get it to work at all

error is : ( translated form the dutch language )

can`t connect as the target computer actively refused the connection

Strange as i am on the same domain as the exchange server and use
windows
authentication to the server ( .Net 2.0 ) with outlook i can send
e-mails
without anny problems ( and i can ping the exchange server )

does something has to be done at the MS exchange side or am i missing
something ???
regards

Michel Posseth




Jul 30 '06 #9

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