On 21.06.2014 20:57, Kaz Kylheku wrote:

I'm guessing:

  H=X [Z]  --  host gave no HELO; X is a reverse lookup from Z.
  H=(X) [Z] --  X was given as HELO; but matches Z
H=X ([Y]) [Z] -- X was reversed from Z; host gave Y numeric IP as HELO H=X (Y) [Z] -- X was reversed from Z; host gave Y non-numeric item as HELO

No, I think that's not it. Rather:

- unparenthesized token: looked-up host name.
- parenthesized token: HELO string (with brackets if IP).
- bracketed token: connecting IP.

The third one is always present; either of the preceding two may be absent, but they are always in this order.

The looked-up host name is missing if the IP doesn't reverse-resolve.

The parenthesized token is absent if there was no HELO (or empty?)


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