hi, i have a server has no internet access,
but it needs to send email to other PC (this pc can ssh to the server)
can i know what pre requisite i need
there are mail server,dns server on the network

my idea is to relay on the mailserver.
is this work?

note:the server only need to send email, do not need to receive email

You don't *need* DNS if it's not already there. Just put an entry to otherpc.domain.com in /etc/hosts and then any mail addressed to that domain will, on most default systems, be sent to that IP address. You'll then just need a mail server on the other end configured to recieve that specific domain.

hi thx for your reply.
i m using postfix. so i just put mailserver's ip on my main.cf relayhost, and then add a pc name on etc/hosts?

the server is just a normal server, it will relay on the mailserver to send the email
any setting i should do?
thx

From what I gather, you've one server - your mail server - from which you send mail. Right? And you say you're hoping to 'receive' email on a PC which SSHs into the server. Right?

Take a step back for a minute. Your sending server - let's call this Server A - will need to 'speak' to the receiving Server B ('PC' as you've called it in this case) over SMTP. The receiving server will then say "hey, thanks - got the message" and depending on what rules you've set up, it'll either be delivered locally, or processed further.

Right now, you're saying the receiving server is able to SSH to the sending server. Unless, however, you're doing something exotic like using SSH to set up a reverse tunnel, triggering Server A to flush its mail queue via an unbound port back to the SMTP listener on Server B (which is possible, but ridiculous), forget about SSH.

It's hard to work out what you mean by 'relay[ing] on the mailserver to send the email'... can Server A and B see each other 24x7? If you set a hostname to loopback (ie 127.0.0.1 lenny.local in /etc/hosts, for example), you can then set up aliases as address:user in your Postfix configuration on box A and simply connect via, I don't know, whatever client you like on the PC - 'Server B' - to retrieve the mail.

Flesh out your set-up a little more and me wight be able to help you better.

I hv a server A,linux, need to send email but no internet access
Another server, is a mailserver, is up already and able to send email

My question is, my serverA is not connected to internet, how can I send email?
If I'm Using relay,what do I need to set in postfix
Thx