AL> I have recently noticed that some versions of BinkD are listing a
 AL> 64-bit value for the Unixtime sent in M_GOT frames acknowledging
 AL> received files.

Which versions do this and what bit width is used with the M_FILE command?

 AL> This, of course, can cause issues for mailers that
 AL> are expecting a 32-bit value. FTS-1026.001 (Binkp/1.0 protocol
 AL> specification) does not specify the size of this field.

 AL> I can see the value of switching to a 64-bit Unixtime; it will solve
 AL> the upcoming year 2038 problem.  However, if it breaks compatibility
 AL> with other existing Binkp mailers, we should implement some mechanism
 AL> to only enable this feature if the remote mailer explicitly supports
 AL> it.

Does it break compatibility with any mailer? You didn't mention any specific
example.

--- GoldED+/LNX 1.1.5-b20180707