Lyris User's Guide
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Mail Server Coexistence
Table of Contents
Lyris Email Commands
Web Interface for Users
Server Administrator
Site Administrator
List Administrator
Other Topics
Add-On Packages
Installing and Upgrading
Installing Lyris
Installing Lyris on Unix
Mail Server Coexistence
Having Sendmail coexist with Lyris
Use two TCP/IP addresses
Sendmail forwards to Lyris
Lyris forwards to Sendmail
Disable Sendmail
Having Post.Office coexist with Lyris
Having Qmail coexist with Lyris
Having MetaInfo sendmail coexist with Lyris
Having Netscape Mail Server coexist with Lyris
Having Notes / Domino Coexist with Lyris
Having NTMail Coexist with Lyris
Having Microsoft Exchange Coexist With Lyris
Having AltaVista Mail Coexist with Lyris
Upgrading to Lyris from Another List Server
Frequently Asked Questions

Mail Server Coexistence

The section discusses how to have Lyris run on the same machine as another mail server program. If you are running Lyris on a machine where there is no other mail server, you do not need to read this section.

Windows Mail Servers

Post.Office: see Having Post.Office coexist with Lyris.

Microsoft Exchange: see Having Microsoft Exchange Coexist With Lyris.

Netscape Mail Server: see Having Netscape Mail Server coexist with Lyris.

MetaInfo Sendmail: see Having MetaInfo sendmail coexist with Lyris.

NTMail: see Having NTMail Coexist with Lyris.

AltaVista Mail: see Having AltaVista Mail Coexist with Lyris.

Unix Mail Servers

sendmail: see Having Sendmail coexist with Lyris.

qmail: see Having Qmail coexist with Lyris.

OS/2 Mail Servers

sendmail: see Having Sendmail coexist with Lyris.

Other Mail Servers

If you are using a different mail server than one mentioned above, the answer depends on whether your mail server has a feature necessary for coexistence with Lyris. In most cases, you will spare yourself considerable work if you can find a machine that is not running a mail server, and install Lyris on that machine. Most mail server companies never planned on coexistence as a need, and consequently made it impossible for Lyris to work with them.

The issue is that your mail server wants to receive all the mail sent to your machine, and thus Lyris never gets a chance to see its own mail.

There are three techniques for having Lyris coexist with your mail server.

If your machine has more than one TCP/IP address, and you can tell your mail server to leave at least one of those TCP/IP addresses unused, then Lyris can coexist on one (or multiple) TCP/IP addresses, and your mail server can exist on another. sendmail, for instance, supports this technique.

Another technique is to configure Lyris to receive mail on a different port (port 26 is common) and then configure your mail server to forward Lyris mail on to Lyris running on a different port. To use this technique, you set up an alias for your machine (by adding a DNS 'A' RECORD) and inform your mail server that mail received for this address should be forwarded to Lyris that is running on a different port. Post.Office supports this technique.

Finally, a third technique is to move your mail server to another port, let Lyris answer mail on port 25, and inform Lyris to forward non-Lyris mail on to your mail server that is running on an alternate port.

If you have any questions about coexistence, please free to email us at


Other pages which link to this page:
  • Installing and Upgrading
  • Page 468 of 556