On Sun, 2006-03-19 at 14:53, Mikkel L. Ellertson wrote:
>
> I also do simple debugging work to directly connect to
> these companies' mail servers, mainly "telnet
>
mailservers.othercompany.com 25" commands,but they
> always timeout. "nmap -p 25
>
mailservers.othercompany.com " commands say that the
> TCP 25 ports are filtered.
>
> Any suggestions for me to send out emails?
>
Chances are, your ISP is blocking outgoing port 25 connections. You
what a couple of choices here. One is to convince your ISP to open
up outgoing port 25 connections for you. The other is to configure
Sendmail to use your ISP's mail server as its relay host. You will
probably have more luck setting up the relay host.
Setting up a relay host may be as simple as editing the Sendmail
config file to add the relay host, or a bit more complicated if
your ISP requires authentication in order to send mail through it.
If you do not have experience with configuring Sendmail, you may
want to consider using Postfix instead. Most newbies find it easyer
to configure...
The ISP should have provided the information about the mail
server to use as a relay. Add it in /etc/mail/sendmail.mc like:
define(`SMART_HOST',`my_isp_relay.com')
and restart sendmail. I doubt if postfix makes it a great
deal easier than that...
--
Les Mikesell
lesmikesell(a)gmail.com