invalid header: missing required header field

[Markus Schönhaber]

11.02.2018, 10:39 CET, Voytek:

> On Sun, February 11, 2018 3:45 pm, gerry at massat.net wrote:
> 
>>
>> So why does my Thunderbird show your message date as: 12/31/1969 6:00PM?
>> Your headers from your Sent folder do not match what I see in your post,
>> here is a snippet showing a Date that looks unusual to me:
>>
>> Message-ID: <dd03a1bcc7c83dbfe18bcd59f700aec5.squirrel at geko.sbt.net.au>
>> Date: 1518238414
>> Subject: invalid header: missing required header field
>> From: "Voytek" <lists at sbt.net.au>
>> To: amavis-users at amavis.org
>> User-Agent: SquirrelMail/1.5.2 [SVN]
> 
> 
> Gerry, not sure...
> 
> isn't 1518238414 unix epoch seconds that comes as 10/2/2018 @ 4:53Z ?

True, but irrelevant.
This is how the value of the Date: header field of an email message is
supposed to formatted:
https://tools.ietf.org/html/rfc2822#section-3.3

IOW 1518238414 as a value for the Date: header is simply garbage.

-- 
Regards
  mks