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General Client Configuration Recomendations

In general, citadel offers usual mail protocols. But, with some assumptions that ease the admins and the programmers life and makes the system more fool proof. You should read this carefully before integrating citadel in your network and firewall concepts. Citadel just offers plain auth, so if you're connecting via the internet be sure to have done StartTLS or have a SSL conenction.

What is StartTLS/SSL?

Both of them do encryption. StartTLS starts plain text communication, and afer some conversation the client issues a StartTLS command, that initiates the encryption. SSL is just wrapping encryption around the base protocol, you could use the plain text protocol port, and wrap STunnel in front of it to achieve allmost the same result.

What do you mean by Relaying / Local delivery?

SMTP

The default internet mail protocol. Citadel speaks this via 5 ways, that offer several ways through the Citadel application stack:

POP3

Pop3 just gives you access to your Inbox by design, as it doesn't know folders.

IMAP

Imap is Mail access Protocol, like SMB is for files. It knows folders and more advanced operations. Though the original intend of this approach is to leave the mails on the server and just browse them via networking, disconnected imap is available in some clients to reduce the traffic for Roadwarriors over low bandwith connections.

Binding a service to more than one port

As noted above, citadel offers several SMTP services, and separate ports for the SSL enabled versions of several protocols. Thus it is not possible to bind several ports with one service.

However, if you want to make the same service available on multiple ports, your operating system can usually do this for you. For example, if you are running Citadel on port 25, here is a way to get Linux to also listen on port 2525 and redirect connections to port 25:

/sbin/iptables -t nat -I PREROUTING -p tcp --dport 2525 -j REDIRECT --to-port 25

This would be used if, for example, you have a draconian ISP that blocks port 25 and you need to arrange to have your inbound email relayed via an alternate port.

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