smtp-port verifiedimportantWritten by the Hub
Ports for plain SMTP
in the configuration this is a line
smtp-port: 25Port or ports on which mail is accepted, with STARTTLS available if a certificate is configured.
Values
- Values
ports and ranges, e.g. 25,2525,1024-1026- Default
25 · taken from the build- applying
restart required- where it can be set
in the config file · with a startup flag · as an environment variable
In detail
Accepts a list and ranges — 25,2525,1024-1026 — so one node can take submissions on several ports at once, which is how a single engine serves customers who insist on different ports. Hub configures 25251 rather than 25: the node's port 25 is left free, and the intake is somewhere no scanner expects it.
What happens if you get it wrong
Port 25 chosen on a node where something else already listens.The engine cannot bind and does not start; Hub's pre-flight check exists precisely for this.verified by experiment · inference