The document describes how to make sendmail deliver messages to a shared mailbox. It requires copying "envelope recipient" information into message headers e.g. fetchmail typically uses X-Envelope-To: header.
Unlike solution suggested in sendmail FAQ (Q3.29) which stores one message copy per every recipient this solution stores only one copy of the message.
This page is mentioned in PROCMAIL QUICK START by Nancy McGough.
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MODIFY_MAILER_FLAGS(`PROCMAIL',`+m') MAILER(`procmail')
Required mailertable entry:
shared-mailbox.domain procmail:/etc/procmailrcs/shared-mailbox.domain.rc
Make sure that shared-mailbox.domain IS NOT a local email domain. To get list of local domains use:
echo '$=w' | sendmail -bt
Required access entry [syntax supported by sendmail 8.10+]:
to:shared-mailbox.domain RELAY
user1@shared-mailbox.domain ! user2@shared-mailbox.domain ! @shared-mailbox.domain error:nouser user unknown