MailerQ features a built in SMTP server. This SMTP server allows you to use SMTP to inject email into MailerQ. The emails that you submit to the SMTP server will be published to one of the following queues:
To decide whether an incoming message should be sent to the normal inbox queue, or to one of the other queues, you can use the management console the edit the list of local email addresses.
All email addresses that are passed to the "RCPT TO" command are compared with this list. If there is a match, the message will be published to the local queue instead of the inbox queue.
The local email addresses are also used to decide whether authentication is required. If you've set an SMTP login and password in the config file (or when a plugin handles authentication), MailerQ only accepts messages over secure and authenticated connections. Email messages that are sent without using STARTTLS and without authentication, are normally rejected.
However, emails sent to local addresses are always accepted, even when the client was not authenticated and/or when the connection was not secure. Clients that send a "RCPT TO" instruction with a local email address will always succeed in injecting their mail.
If you've assigned a special "reports" queue, MailerQ preprocesses all local deliveries to detect whether the message contains some sort of delivery or disposition report. DMARC reports and non-standardized reports are also automatically recognized and placed in this reports queue.
Incoming messages that are not accepted (because they were not local, and did not come from an authenticated client) are normally blocked and not placed in any queue. However, if you've set up a "refused" queue too, these messages will be saved in this queue. This can be used for debugging purposes.
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