How to configure SeaMonkey to connect to an email account
SeaMonkey is an open source internet suite that includes a browser, an email and newsgroup client, an IRC chat client, an HTML editor and web development tools. You can download it for free from the SeaMonkey official site.
You can create an email account which you can later add in SeaMonkey from the Email section of the Pixie control panel. Read the tutorial on creating an email account if you need more information on this subject.
After you start SeaMonkey go to the Window menu and select Mail & Newsgroups to open the mail client. If you haven't used it so far and there are no accounts in it the setup process will begin automatically (otherwise go to Edit>Mail & Newsgroups Account Settings>Add Account). On the first page of the Account Wizard the Email account button is marked by default, so just click on Next.
On the next page you have to type your name (any name) and the full email address (e.g. firstname.lastname@example.org). After that click on Next to go to the next page where you have to select IMAP or POP for an incoming server type and also to type the names of the incoming and outgoing mail servers. For server names you can use just your domain name (e.g. yourdomain.com), as long as it points to our servers, or the name or IP address of the server where your account is hosted. If you want to use encryption, however, you have to use the name of the HostKnox server.
On the next page type your email address in the field for Incoming User Name. On the following page type the account name which you want to see displayed in SeaMonkey (it doesn't have to be your email address). After that click on Next and then on Finish. The email account will be added in the email client.
Then you have to set the correct port numbers for the incoming and outgoing mail servers and optionally enable encryption. In the SeaMonkey email application click on the Edit menu and select Mail & Newsgroups Account Settings. Then click on Server Settings (on the left) and if you want to use encryption select SSL/TLS from the Connection security drop-down menu. The port numbers for the incoming server are the following: 993 for IMAP with encryption; 143 for IMAP without encryption; 995 for POP with encryption; 110 for POP without encryption.
Then on the left side click on Outgoing Server (SMTP), then on the Edit button and to use encryption set the respective menu to SSL/TLS. The port numbers for the outgoing server should be: 465 with encryption; 587 without encryption.
After you configure all the options you should be able to manage your email account through SeaMonkey.
For screenshots and some more details check out the tutorial on configuring SeaMonkey to connect to your email account.