Having Sendmail Coexist With ListManager
Note that this documentation is current for Sendmail versions up to 8.12.9. For further inquiries about Sendmail beyond the scope of this documentation, please see http://www.sendmail.org/.
In order for ListManager to function correctly, it needs to be able to receive email.
ListManager runs its own SMTP daemon for accepting email. Since you are probably running "Sendmail" (or some other mail server), you will need to decide which method you want to use so that ListManager and Sendmail can both receive email.
1) USE TWO TCP/IP ADDRESSES: assign two TCP/IP addresses to this machine. Tell Sendmail to run on one TCP/IP address, and ListManager runs on the other.
2) SENDMAIL FORWARDS TO ListManager: create an alias and tell Sendmail to forward email addressed to the alias to ListManager that runs on another port.
3) ListManager FORWARDS TO SENDMAIL: move Sendmail to another port and inform ListManager to forward non-ListManager bound mail to Sendmail.
4) DISABLE SENDMAIL RECEIVING: disable Sendmail mail receiving, and allow ListManager to receive all mail sent to this machine.
Method "1" is the easiest approach. Method "2" is recommended for most sites. Depending on your needs, you may find methods "3" or "4" acceptable.
More
Sendmail forwards to ListManager
ListManager forwards to Sendmail
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