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I need to Changes Letter OutHouing Server on-fly

Posted on 2002-03-30
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Last Modified: 2010-04-04
Problem synopsis:
I am using several internet providers to get into Internet (there are several Internet Connections on my PC)
Each internet provider has his own SMTP server (outgouing server). If i decide to change the Internet connection - i begin using an Internet Connection that differs from my default Internet Connection - then i start having problems with sending letters because new Internet Connection has different SMTP server.
Of cause I can change SMTP server for all mail accounts in my Outlook but it is not useful if i change Internet Connection often or If I use other mail client program (the Bat)

Problem solution:
1. Manually change SMTP server for all accounts in my Mail Client Program(OutLook,  The Bat, ect) everytime when i change Internat Connection. (VERY INCONVENIENT and I don't want to do it)
2. Change SMTP for each letter that is going to be send on the System level. (I don't know how :( ).

I would like to make a program that will determine what Internet Connection is active and depending on this connection will change the mail OUTGOUING server on fly.
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Question by:penich
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Accepted Solution

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AvonWyss earned 300 total points
ID: 6908545
There are free RAS/DialUp components available for Delphi which will allow you to monitor the state of your connections. Now, whenever a connection is made, I'd replace the HOSTS file with one customized fr your needs. The HOSTS file is a text file which is used when Windows tries to resolve host names before it queries a DNS server. Therefore, if you define a a name there (for instance, "SMTP") and set its IP depending on the provider SMTP server, you'll not have to change the configuration of any email application.

Windows 95/98/ME:
The HOSTS file (NO extension!) is to be found in the WINDOWS directory. The file may not yet exist, but there will at least be a HOSTS.SAM (SAMple) file which you can use as template.

Windows NT/2000/XP:
The HOSTS file is to be found in the (windows)\SYSTEM32\DRIVERS\ETC directory.

RAS components:
http://www.torry.net/ras.htm
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Author Comment

by:penich
ID: 6935928
Thanks a lot AvonWyss!!!
I tested what you told me and figured out that it works
I appritiate it and already use this program
If you are interesting in it - here is the program i wrote
http://penich.tomsk.ru/SMTPSwitch.exe
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LVL 14

Expert Comment

by:AvonWyss
ID: 6936945
penich, glad that I was able to help! Since I have a cable connection here, I don't need to switch ISPs, but I appreciate you posting the link here. Have a nice weekend!
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