Local SMTP Delivery
By employing local SMTP, the burden of routing messages to suitable storage becomes a configuration problem within the mail system itself.
Here, imip-agent connects to the mail transport agent (MTA) and sends a message to an explicitly-indicated local user. For example:
Local System Users
With such a local user indicated, the message is then routed to a mail delivery mechanism, perhaps by converting the local address to a local system user identity (a user with an account on the system running the software). For example:
The local delivery mechanism would then deposit the message in the user's mailbox. MTAs typically provide such routing for local system users by default.
Alternatively, with a local user having been indicated, a message would be routed for delivery by a mail storage solution which would accept the message for the indicated user and deliver it to that user's mailbox. For example:
Where such routing is performed to mailbox providers employing LMTP, some additional configuration effort may be required. See the mailbox integration guide for more details.