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Date: 19 Jun 2003 09:25:53 +0800
From: Uwe Dippel <>
Subject: Re: Using Popa3d


seems you have to read up a bit, yes.
Here a few little helpers:
Firstly, mail consists of two parts: forwarding and access.
mailservers throughout are for access / delivery. So is popa3d.
I don't know about Slackware, but on my system the users have mailboxes
under /var/mail. The system creates a box automatically as soon as a
user receives a mail. So whatever is in that box, it will be delivered
to the client as pop-mail as soon as that client is configured. Or
easier: when the user logs in to that system, the system will inform the
user: You have mail.
To actually get mail into those boxes, you need a transfer agent
(sendmail, postfix, etc), whose tasks are to forward mail; either to a
local box or another machine.
So your Send: juan@....168.0.100 firstly needs that agent ('MTA') on the
box from which you are sending, out to Then on that an MTA needs to find out that it is for local delivery.
And accept it and pass it into the mailbox of juan.
This last part is the most difficult one, due to 'relaying'. Think of
spam. The MTA must not accept anything that hasn't originated from your
domain *or* is to be delivered to your domain! The default settings of
MTAs in the good old days was: try to be helpful: if sent mail to your MTA for, your MTA would helpfully pass it on. This is called
'relaying' and must not happen any more.
So, instead of debugging popa3d, you better start with the MTA. Try to
send local mail from user1 to user2. When user2 logs on, "You have
mail"; or you look at /var/mail/user2 directly ('less' / 'ls -l').
As soon as this works out, popa3d will probably do a good job as well.
But start with the MTA !

Good luck,


On Thu, 2003-06-19 at 04:26, Juan wrote:
> Hi,
> I am searching a guide to learn to utilize popa3d. I am running the
> Slackware 9.0 distro, and using popa3d which came with it. I have ran "#
> man popa3d" and there says that the options are two. So i ran "# popa3d
> -D" and suppose that automatically popa3d configures users for receiving
> mail. The thing is that the Linux box is connected to a Windows machine.
> When I try in Windows to send a message to the Linux box, I put:
> Send: juan@....168.0.100 <mailto:juan@....168.0.100> 
> and failed to receive the message.
> Apparently, the popa3d is running ok, but i have no way to send
> messages, and don't know where popa3d stores them.
> Do you know of a user guide that explains more than the man page?
> Thanks in advance.
> Juan

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