open https://gitlab.synchro.net/main/sbbs/-/issues/278

At the bottom of every nodelist, there is a notice about the PING flag which states:

~~~feature
Nodes flying this flag will adhere to the following functionality:
;S
;S 1) PING-function:
;S """""""""""""""""
;S If a message destined to "PING" arrives at its final destination ;S and this final destination flies the "PING"-flag, then the
;S receiving node will bounce the message back to the original
;S sender clearly displaying all the original via-lines.
;S
;S If a message destined to "PING" arrives at its final destination ;S but this final destination does _not_ fly the "PING"-flag then the
;S message may be deleted from the inbound-queue without further
;S follow-up.
;S
;S 2) TRACE-function:
;S """"""""""""""""""
;S If a message destined to "PING" arrives at a node which flies
;S the PING-flag but is merely passing-through to another destination
;S then the in-transit node will notify the sender of this occurence
;S and will forward the original mail unaltered towards its final ;S destination.

~~~
SBBS Supports the PING functionality (around line 4000 of sbbs.c), but doesn't report back when it is a pass-through system (aka TRACE)

There has also been some discussion about separating the TRACE and PING functions. Support for that would be nice.

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