[lug] Sending POP email thru firewall

[George Sexton]

There really is no such thing as "sending POP email". POP is a protocol for
retrieving Email.

SMTP (port 25) is used for sending Email.

Is your problem really related to retrieving POP messages, or sending Email?

> -----Original Message-----
> From: lug-admin at lug.boulder.co.us [mailto:lug-admin at lug.boulder.co.us]On
> Behalf Of Justin
> Sent: Tuesday, July 11, 2000 12:59 PM
> To: BLUG
> Subject: [lug] Sending POP email thru firewall
>
>
> I have some client machines that are having trouble sending POP email thru
> my ipchains firewall. Everytime I try to send an email I get a connection
> time out because the pop server cannot be contacted. I can
> recieve mail just
> fine however. Another thing is, while trying to watch the packets
> go thru the
> firewall with sniffit I noticed that when the local interface is in
> promiscuous mode the mail goes thru. I have the following rules for POP
> input/output:
>
> EXTERNAL_INTERFACE="eth1"
> LOCAL_INTERFACE_1="eth0"
> IPADDR="my.ip.adress"
> LOCALNET_1="192.168.1.0/24"
> UNPRIVPORTS="1024:65535"
>
> # POP client (110)
> # ----------------
> ipchains -A output -i $EXTERNAL_INTERFACE -p tcp  \
> -s $IPADDR $UNPRIVPORTS \
> -d mypop.server.com 110 -j ACCEPT
>
> ipchains -A input  -i $EXTERNAL_INTERFACE -p tcp ! -y \
> -s mypop.server.com 110 \
> -d $IPADDR $UNPRIVPORTS -j ACCEPT
>
> ipchains -A output -i $EXTERNAL_INTERFACE -p tcp  \
> -s $IPADDR $UNPRIVPORTS \
> -d pop.dnvr.uswest.net 110 -j ACCEPT
>
> ipchains -A input  -i $EXTERNAL_INTERFACE -p tcp ! -y \
> -s pop.dnvr.uswest.net 110 \
> -d $IPADDR $UNPRIVPORTS -j ACCEPT
>
> This problem has plagued me for a long time. Is there anything
> special that
> needs to be done for mail to be sent thru? Any ideas?
>
> Justin
>
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