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GNO Mail Connection Information


This document is intended for GNO mail system users. It is provided as a description of services so as to give users sufficient information so that they can configure standalone mail clients for use with this system.

The Information in Brief

Here, in brief, is the information you need in order to connect to our mail server. See the following sections for more background information.

        protocols:              IMAPS
        security:               SSLv3
        authentication method:  plain
POP3S support is currently disabled. Contact us if you really need this, but please read the rest of this page first.
    MTA (optional):
        protocols:              SMTP + TLSv1 or TLSv3 (port 25)
	                        SMTP + TLSv1 or TLSv3 (port 587)
				SMTPS (port 465)
        authentication method:  plain

Do note that the authentication method is plaintext over SSL or TLS. If you select options in your client like "CRAM/MD5" or "secure password" then you will not be able to properly authenticate.


Almost all modern mail systems have three main components. They are:

  1. The MUA or Mail User Agent. This is your mail reader, such as Netscape Communicator, Eudora, Pine, or Mulberry.
  2. The MDA or Mail Delivery Agent. This is the server to which you connect to retrieve your mail. Two types commonly-known MDA protocols are POP and IMAP.
  3. The MTA or Mail Transport Agent. This is the server to which you connect in order to send new mail. The most common MTA software is sendmail, but there are other types. Most MTAs use the SMTP protocol.

General Information

This server is capable of supporting two MDA protocols, which we summarize here, however currently only the first is enabled:


With IMAP, your mail is always kept on the server (until you delete it and expunge the deleted messages from your mailbox, or move your mail to another mailbox). Your client may keep a cached copy of your mail so as to minimize network traffic. If your client supports disconnected-mode IMAP, then you can read your mail while disconnected from the server (which is a good idea for dialup accounts or if you're anticipating on being stuck somewhere like an airplane without network access). IMAP accounts support multiple sub-mailboxes under your primary mailbox, thus allowing (for example) for having the server pre-sort your email for you.

POP3 over SSL

POP clients usually have two modes, "download and keep mail on server", and "download and delete mail from server". The former is similar to IMAP, but without the benefit of multiple mailboxes on a given server, and thus no sorting. With the latter, the server has no record of your mail after it is downloaded. This can be good if you're worried about exceeding your mail quota, but bad if your client crashes and loses all of your email.

Note that the download-and-delete mode of POP clients is not compatible with using multiple clients, including mixing a POP client with the webmail interface.

If you are not otherwise tied to POP, it is suggested that you use the IMAP protocol due to the limitations many clients place on POP servers.

Since we don't provide technical support for your mail client, you're of course welcome to use whatever mail client you want. A generally good client that runs on MacOS, Windows, and a few UNIX variants including Linux and Solaris is Mulberry. Mulberry used to be a commercial product, but is now freely available. Mac Mail is also a decent client, although it is restricted to MacOS.

The MTA, in the interests of spam (UCE/UBE) control, has restrictions on the type of mail it will handle. Inbound mail will, in general, be allowed only if it is addressed to or other domains hosted by this site. Various other types of anti-spam measures are also in place in order to cut down on the crud being delivered to our users. It's not perfect, but it gets rid of most of the junk mail.

In the interest of supporting mobile computing, the MTA will accept arbitrary mail from clients which have logged in. The supported authentication method is plaintext username/password over TLSv1, TLSv3, and SSL as described in the "Information in Brief" section at the top of this page.

GNO Consortium

Maintainer: Devin Reade
Last Updated: 14 May 2011

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