It's "fixup". I believe it serves to define the service that is used at
that particular port, allows you to remap the service to a different
port, and in the case of at least the smtp port, restricts service.
In this case, only 5 SMTP commands are permitted (no ESMTP, RCPT or VRFY
for example). It also changes the banner that is displayed upon
connecting to the mail port. My guess is that it's a proxy of sorts.
| Dan |
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