By default the sendmail in RH 7.1 comes with accepting mail from
other hosts/servers turned off as a security precaution.
1. Check your /etc/mail/sendmail.mc file for the following line:
DAEMON_OPTIONS(`Port=smtp,Addr=127.0.0.1, Name=MTA')
2. Insert a "dnl" in the front to comment it out.
3. After this you'll need to rebuild your sendmail.cf file.
m4 /etc/mail/sendmail.mc > /etc/sendmail.cf
4. Now restart the machine or just sendmail.
service sendmail restart
Good luck,
Tuan
On Fri, 19 Oct 2001, Fabian Gervan wrote:
> Hello ,
> I have a problem with redhat 7.1 kernel 2.4.9, no firewall.
> i can't telnet to some mail servers (port 25).
>
> [root@qmail /]# telnet bombay.telecom.com.ar 25
> Trying 200.3.94.68...
> (timeout).
>
> To others server, it work fine.
>
> I put the same public IP in a redhat 6.2 (2.2.18) or windows2000
> profesional and then, y can telnet nicely....
>
> [root@ftp /]# telnet bombay.telecom.com.ar 25
> Trying 200.3.94.68...
> Connected to bombay.telecom.com.ar.
> Escape character is '^]'.
> 220 bombay.telecom.com.ar Generic SMTP handler
>
>
> Any idea?
> here is any configurations of my redhat 7.1:
>
> >[root@qmail /]# ip address show
> 1: lo: <LOOPBACK,UP> mtu 16436 qdisc noqueue
> link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
> inet 127.0.0.1/8 brd 127.255.255.255 scope host lo
> 2: eth0: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc cbq qlen 100
> link/ether 00:50:04:7c:bd:1d brd ff:ff:ff:ff:ff:ff
> inet 200.47.43.241/24 brd 200.47.43.255 scope global eth0
> inet 10.1.0.200/16 brd 10.1.255.255 scope global eth0:1
> 3: tunl0@NONE: <NOARP> mtu 1480 qdisc noop
> link/ipip 0.0.0.0 brd 0.0.0.0
> 4: eth1: <BROADCAST,MULTICAST,PROMISC,UP> mtu 1500 qdisc cbq qlen 100
> link/ether 00:40:96:47:2e:93 brd ff:ff:ff:ff:ff:ff
> inet 10.2.0.1/16 brd 10.0.0.255 scope global eth1
>
> >[root@qmail /]# ip route show
> 200.47.43.0/24 dev eth0 proto kernel scope link src 200.47.43.241
> 10.2.0.0/16 dev eth1 proto kernel scope link src 10.2.0.1
> 10.1.0.0/16 dev eth0 proto kernel scope link src 10.1.0.200
> 127.0.0.0/8 dev lo scope link
> default via 200.47.43.254 dev eth0
>
> >[root@qmail iptables]# iptables -L -n
> Chain INPUT (policy ACCEPT)
> target prot opt source destination
>
> Chain FORWARD (policy ACCEPT)
> target prot opt source destination
> all -- 10.2.0.0/16 10.1.0.0/16
>
> Chain OUTPUT (policy ACCEPT)
> target prot opt source destination
>
> >[root@qmail /]# ip rule show
> 0: from all lookup local
> 32766: from all lookup main
> 32767: from all lookup 253
>
>
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