anti 5631d09aa8 fix: reject empty HELO/EHLO with 501 per RFC 5321 ...

EHLO/HELO require a domain or address-literal argument. Previously
the server accepted bare EHLO with no argument and responded 250,
which deviates from the spec and makes the honeypot easier to
fingerprint.

2026-04-14 00:30:46 -04:00

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