Hello All,

I have installed SQUID PROXY on centos 5...

The users are not able to download emails...

I disabled IPTABLES. Please suggest me whats the next step...

Thanks in Advance

Squid has NOTHING to do with POP3 at all. Squid is an HTTP proxy and does NOT deal with email at all. Please describe the actual solution you are trying to make work.

configure squid in transperant mode .. here it is
http://www.cyberciti.biz/tips/linux-...uid-howto.html

Thats Correct Squid has nothing to do with mails.

where did you found that squid is blocking ?

What? No, that's not at all what he's asked about.

Hello All,

Thanks for giving reply... I am a beginner in Linux...

The issue is I am able to download emails without connecting to Squid. When am connecting to am unable to download emails (able to send). If squid is not a problem Why am able to receive emails when am not connected to squid.

I have seen lot of answers related to IPTABLES. I donno what is that and how to configure. Soo I stopped it ...

Please let me know.. If I need to submit any log files let me know the path please...

Thanks,
Sai Krishna

when not connected to squid? how are you connecting to it? If you are about to download without using squid... then... there's no problem! Squid isn't a pop3 proxy. it's not meant to work.

Hello Chris,

I am implementing Squid Proxy in test environment. If everything is fine I will move this into users side. Can you please help me in this.

How can I know Squid is not blocking/not blocking POP3. If squid is not blocking Why am unable to download emails...

Please let me know

Thanks,
Sai Krishna

You don't say how they're downloading/sending...from what kind of client? Web? On what operating system are the clients using? More likely is the fact that once you sign into the proxy server, ALL outgoing traffic is running through Squid...and, since (AGAIN), squid doesn't handle POP3, it's stopping there. BEFORE you sign in, you probably have an open, outgoing route (which is unsafe), which lets things work.

Try using IPtables to redirect the POP3 traffic through an open port in your firewall.

You know this because, AGAIN, SQUID IS FOR WEB TRAFFIC ONLY....NOT POP3 OR ANY OTHER PROTOCOLS PERIOD. That's been said before...can't say it much simpler than that.

Hello Chris,

The client is Microsoft Outlook.

Other than squid. We are using Firewall to connect to internet.

is there any other reason for not downloading emails to the client OUTLOOK.

Thanks for the information. Please let me know How to redirect by using IP tables.

Thanks
Sai Krishna

My name isn't Chris
...which means you're running Windows clients, correct? You don't actually provide the information requested.
Did you not read/understand what you were told? When your clients are signing into squid, ALL of their outgoing traffic is routed through squid at that time. AGAIN...since squid does NOT do anything with POP3, the connection fails. Before signing in, the traffic is going straight to your firewall, and out. Can't say it much simpler.
Did you try to look this up? Putting "linux iptables pop3" into Google pulls up lots:
http://www.cyberciti.biz/tips/linux-...l-request.html
http://www.thegeekstuff.com/2011/06/...ules-examples/

...and, if you're using SMTP to SEND, you realize that's a different protocol, right?? So before you ask, here's a link to prevent you from having to actually look it up:
http://www.cyberciti.biz/tips/linux-...-protocol.html

Hello TB0ne,

Thanks for the information.

taken some time to understand.., sorry for that.

I will try with the provided links and let you know if I run into any issues.

Thanks,
Sai Krishna