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How to Enable POP3 and SMTP on a Proxy Network that Disabling them?

Hi I am connected to a LAN with a proxy that disable the POP3 and SMTP services, is there a tricky way that I could enable these services without telling the IT team (they are disabling them for no real reasons)?

Is there a tunnel application for such case?

I want to use the POP3 and SMTP to access my email account via MS Outlook 2003 on a Windows XP Pro SP2 operating system.

Thanks in advanced,
Salan..
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salan_alani
Asked:
salan_alani
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3 Solutions
 
canaliCommented:
Tunnelling is possible, if you have a server outside of your lan to end the tunnel  
http://www.nocrew.org/software/httptunnel.html (gpl)
http://www.http-tunnel.com/html/ (free standard speed - pay for more speed)
or if your mail provider is supported the solution is:
http://www.freepops.org/
FreePOPs is an easily extensible program, which allows access to the most varied resources through the POP3 protocol.
Mainly, it can be used to download mail from the most famous webmails, but it could also be used as an aggregator for RSS feeds and much more. This way it is possible to get all your messages in your favorite email client.
FreePOPs is Free Software!

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BembiCEOCommented:
POP3 / SMTP are using well known TCP/IP ports (110 for pop3 and 25 for SMTP). If your admin blocks these ports, either by a proxy or a firewall, you have either to go around the proxy / firewall with these services or use a tunnel through the services (as canali said). A tunnel is a connection between two nodes.

But usually, your admins are not only simply blocking these two ports, they are blocking everything, but allowing only a few dedicated ports. If you want to go around these limitations, you need another (not blocked) port, which you may not find, if your admins have done a good job (independend from the way, you want to pass the limitation.
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Dushan De SilvaCommented:
Simply using telnet command you can check that required incomming/ougoing ports are opened in both sides.

BR Dushan
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BembiCEOCommented:
Simply using telnet...

A simple port scanner application may be easier as telnetting about 65000 ports. But the general problem is, that the target has to listen to this (different) port. If the default port is blocked, a connection would only work, if the listeners listens on the open port. Means, you can not really go around port 25 to send mails to the public world, you can only work around this for a point to point connection.
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Dushan De SilvaCommented:
No need of scannig all 65000 ports, since we are familiar with POP3/SMTP ports. And no need of installing such port scanners in both sides. You can simply use telnet command. ;)

BR Dushan
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salan_alaniAuthor Commented:
I think they are not blocking the default email ports (POP3=25, SMTP=110), the story is:
From this LAN, we could send/recieve emails via outlook from the default email ports if the email account is belong to @theircompany.com,
but we could not do that if our email accounts is belong @mycompany.com or to @anyothercompany.com

So (as I think), they are only enabling thier email accounts.

More details (maybe help recognizing the problem):
- They could use Exchange Server 2003, but we don't have this feature.
- The LAN is controlled via ISA 2004.

Then in this case, do I need to do some port scanning, and is the tunnel application should work for me.

BR,
Salan
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Dushan De SilvaCommented:
Do you have a real(public) IP address and public DNS record (domain name) for your email server?
If not please take it. Otherwise you cant access your local email server via other networks.
Or else you must have VPN for other networks which you needs to send emails......

BR Dushan
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BembiCEOCommented:
You mean, you use Pop3 / SMTP  Service for regular email traffic, not exchange? For what do you use exchange?

Means, you do not have any exchange server setting within your outlook profile, only Internet mail settings?

If so, you can setup any additional account to receive emails, but if you send out emails, the mails will flow over the first connection within your mail profile.

If you find exchange in your profile, the exchange server may control mail traffic, nevertheless, you can poll down mails from other accounts as far as port 100 is open. For sending, this is a special issue, as exchange do not relay mails from external to external domains by default.

ISA server may block ports, but if you can send mails out, this is done by port 25. Polling mails from one external mail account via port 110 also allows to poll down any account, as far as your admin has not explicitely blocked the domains.

So, a few question to understand your configuration.
- Have a look into your mail profile and tell me, what you find there.
- take one of your external pop3 mail servers you want to communicate to:
-- ping server
-- telnet server 110
-- nslookup server (FQDN)

This is to identify your configuration / mail flow and a few settings on ISA
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salan_alaniAuthor Commented:
- I am using normal Internet Email Setting (not Exchange Server)
- I can't ping my external POP3 server, I can't even ping google.com (Requested Timed Out)
- I can't telnet (Connection Failed via Port 110)
- I can't do nslookup (DNS Request Time Out)
- I could manage my emails only through the web (HTTP)

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Dushan De SilvaCommented:
- I can't telnet (Connection Failed via Port 110)  >>>
You are having firewall issue. Please open perticular port from firewall.(iptable ..or etc)

BR Dushan
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salan_alaniAuthor Commented:
I am using Norton AntiVirus 2005, I already disabled the worm protection.
Still can't telnet: (Connecting To <myPOP3server>...Could not open connection to the host, on port 110: Connect failed)
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Dushan De SilvaCommented:
Can you telnet from any other PC in same LAN ?... Seems your having firewall issue...

BR Dushan
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BembiCEOCommented:
Try to find out the IP-Address of your POP3 server. You can use a public DNS resolver, if you have internet access and nslookup will not work.

http://www.dnsstuff.com

Try to test your POP33 server as described above, but using the IP-Address.

> I could manage my emails only through the web (HTTP)
Whats about outlook? You mean, you do not use outlook for email?

If the tests against the IP_Addresses will fail, your admins have done a quite secure (good is something else) job. If they have really setup ISA to allow only HTTP access from inside to outside, there is not really a change to solve this without your admins.
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salan_alaniAuthor Commented:
I give up, the IT guys are blocking everything.
Thank you for your comments.
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canaliCommented:
Don't give up, I repeat the solution is freepops (if u can navigate ....u need port 80 open or behind a proxy)
with freepops u can use outlook with pop3
example if your mail provider is hotmail (supported by are more than 500 isp)
outlook query the pop3 port on localhost create  by freepops then
freepops connect via http to hotmail    retiving or sending email
outlook speak pop3 protocol to localhost and frepops "transform" pop query in the corresponding http connection...
If your mail provider don't have a webmail supported by frepops give up!
The concept is if u can use some webmail around the world probably freepops can be the gateway to your email client
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