SMTP server

I am using linux slackware ver 3.3?
I want to setup a SMTP server.
Do anyone know how to do so?
Or Can you tell me how test it?
It is because I have setup the POP3 server.
Also, I can use MS outlook express and exchange to send and received mail.
So, should I install the SMTP server?
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KNVB HKSITOAsked:
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henckensCommented:
Check if you have running sendmail (that the smtp server) with
'ps -ax | grep sendmail'
If not, get version 8.8.8 or so (it's GNU so it's easy to get hold on) and install it (manual is included)
If you have sendmail, check if you have a pop3 daemon. Do this wich 'more /etc/inetd.conf | grep pop3'.  If it is there you should get something like this.
pop3      stream      tcp      nowait      root      /usr/sbin/tcpd      /usr/sbin/in.pop3d
Check if the file /usr/sbin/in.pop3d exists.  To check if it is working do a 'telnet localhost 110' you should see the commandline of the pop3d server.
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KNVB HKSITOAuthor Commented:
The implication is that you have sendmail running.  It is waiting for another host to make a connection to the server daemon to send mail to you.  It is used to send mail between mail servers.
If it is working good for you.. don't upgrade :)
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KNVB HKSITOAuthor Commented:
do you mean my Linux host had "became" a SMTP server
successfully?
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henckensCommented:
Sorry! I have another problem right now.
The problem is that I setup an WU-FTPD on the same linux hosts.
However, I can not login the FTP server with local user name password(locally and remotely also cannot).
And then I add a new user without password However, I also cannot use this user to login the ftp server.
But it can respond "access denied" when I use the user name "root" to login.
I checked the ftpaccess file. I found the following statements :
class local real,anonymouse,guest      *
class remote  real,anonymouse,guest   *
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