Need to open port 25

18 Mar 2005 2:37 PM

andyc209

My ISP says that in order for us to get our email on our server we need to
open port 25.

Can anyone help me with this, we do not have a firewall at the moment.

thanks

18 Mar 2005 4:06 PM

William W. Plummer

andyc209 wrote:

> My ISP says that in order for us to get our email on our server we need to
> open port 25.
>
> Can anyone help me with this, we do not have a firewall at the moment.

It sounds like you want to run a POP server on your machine. POP
listens on port 25 for connections from other machines in order to
deliver mail so that it can put it in the right mailbox.

With no firewall or network router box, your machines is exposed to the
network and nothing will be blocking any port. (Not the safest
configuration, however.)

19 Mar 2005 6:55 AM

Andrei Ungureanu

Port 25 is used by SMTP (110 is for POP).
What Windows version do you have on your machine and what kind of mail
server do you have?

--
Andrei Ungureanu
www.eventid.net
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http://www.altairtech.ca/evlog/

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"William W. Plummer" <William.Plum***@alum.mit.edu> wrote in message
news:PpydnbKcdOTRYaffRVn-hw@comcast.com...
> andyc209 wrote:
>> My ISP says that in order for us to get our email on our server we need
>> to open port 25.
>>
>> Can anyone help me with this, we do not have a firewall at the moment.
>
> It sounds like you want to run a POP server on your machine. POP listens
> on port 25 for connections from other machines in order to deliver mail so
> that it can put it in the right mailbox.
>
> With no firewall or network router box, your machines is exposed to the
> network and nothing will be blocking any port. (Not the safest
> configuration, however.)

19 Mar 2005 9:51 PM

William W. Plummer

Andrei Ungureanu wrote:

> Port 25 is used by SMTP (110 is for POP).
> What Windows version do you have on your machine and what kind of mail
> server do you have?
>
>

I stand corrected. Now, why does the ISP want to send mail through the
OP's machine? I do not allow that because that's how spammers work.
The spam will trace back to the OP's machine. If fact, may be this
should be reported to the internet gods for investigation.

19 Mar 2005 11:16 PM

Enkidu

William W. Plummer wrote:

> Andrei Ungureanu wrote:
>
>> Port 25 is used by SMTP (110 is for POP).
>> What Windows version do you have on your machine and
>> what kind of mail server do you have?
>>
>>
> I stand corrected. Now, why does the ISP want to send
> mail through the OP's machine? I do not allow that because
> that's how spammers work. The spam will trace back to the
> OP's machine. If fact, may be this should be reported to
> the internet gods for investigation.
>

They don't. Sounds like they are trying to be helpful.
Either they are agreeing to act as a mail relay FOR the
client (so that mail gets held at the ISP if the client is
down) or they are willing to let the client (who is on the
ISP's network after all) accept mail directly on the SMTP
port, bypassing the ISP's mail server totally. Either way,
the email will go into the client's mailserver via port 25.
hence the need to open port 25.

Cheers,

Cliff

--

Barzoomian the Martian - http://barzoomian.blogspot.com