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by amatthew

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At my business we have an Exchange 5.0 server. We have a single POP account at our ISP that collects mail for the entire domain. On the Exchange server we run a POP3Exchange program that will at reg intervals download all our mail and send it to the Exchange server for delivery within ut office. Our problem comes when we want to send mail. Our ISP will not let us send mail to their SMTP server without us First logging into our POP account and downloading our email. We have no way to synchronize this on our Exchange server. Also using DNS will not work because we must use their mail server to send mail out to the internet. My question is if we placed a linux box on the network could we get it to do what I am describing (POP before send)and then forward all mail to the exchange server?

8 replies

by Former member

Possibly, but here are your parameters: pop before send logs the IP the mail was popped by, and flags that IP as 'OK to send' for a certain amount of time, chosen by your ISP's mail guru. (Usually 15-30 mins, their tech support should know.) if you're not within that time frame you get a relaying denied message. it might be easier to see if you can get your pop/exchange prog to work within those parameters, like checking mail every x mins.

To get Sendmail to do it would likely require some sort of bait-and-switch or IP masquerading on the part of the linux box.

by Former member

I don't understand how is built your network ... but if your Linux box can exit to internet (directly or via firewall) i will let your sendmail do all store-and-forward job.

by hasse mcse/brainbench

Hi!

If you have a direct inet connection via your ISP and have a registerd domain, why don't run DNS of your own and point out the exchange server as mail exchanger in the DNS and all your problems will be solved.

Strange network setup if you have to use a pop3 mail account for your entire domain at your ISP.

/Hasse

by Member 21361443

I don't know exactly what your plans are, but I have a similar setup with my e-mail server. Of course, my e-mail server is Linux-based.

I use Fetchmail to retrieve the e-mail, and send the e-mail directly to it's destination using Sendmail, without sending through the POP account. Sendmail rewrites the internal addresses to the proper domain and sends it directly to it's destination as an intelligent transmitter.

Hope that helps!
brianlusk@netzero.net

by amatthew

Our ISP requires us to use their email server. Apparently they block any SMTP traffic leaving their network except for their mail server. We are using a dial up account. What I would like to do is us Sendmail but have it upload mail immediately after fetchmail downloads from our POP account.

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