I really have no clue as to how this works internally. The test is if your
mail server shows up in the administrator then the function will work for
it. Basically, this is the function used in the admin to do that check.
My thought is that it does a tcp/ip request to the port specified. If so,
then maybe it can also be used to specify if a server or service is running
or not. Use it to check if an FTP server is running on a machine.
At 08:26 AM 8/17/01, you wrote:
>Michael Dinowitz wrote:
> > Checking that the domain exists is easy using the
> > CFUSION_VERIFYMAIL(MailServer, SMTPPort, Timeout) function. It'll return a
> > Boolean true or false id the mail server exists or not.
>
>How does this work internally? Does it do a DNS lookup and search for a
>failover server if it can't contact the main server? Many mail domains I
>know (e.g. most academic domains in the Netherlands) have a setup where
>they block all incoming traffic on port 25 and provide a failover server
>that acts as a smarthost for mail to be delivered to the network
>(130.161.0.0/16 and 145.94.0.0/16 need to go through one server at my
>Uni). This allows them to provide central spam blocking and antivirus
>scanning, while the users can still connect to local servers. I would
>however expect that you can not verify my email server, while it is a
>valid and running server (try it).
>Also, many servers don't accept SMTP connections from computers outside
>a trusted domain that don't have an MX record. If your CF server does
>not have an MX record but your SMTP server does, you might get a false
>negative.
>
>Jochem
>
>
>
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