Gmail (API) - weird empty messages appeared from year 1970
<p>I am working on Gmail API and I am fetching emails. My first step is to list all threads and then call <code>get</code> method for each. However some listed threads can't be reached via <code>get</code> method. </p>

<p>Sample error #1:</p>

<pre><code>{ Error: Not Found
    at Request._callback (/home/kuno/code/an_api/node_modules/google-auth-library/lib/transporters.js:85:15)
    at Request.self.callback (/home/kuno/code/an_api/node_modules/google-auth-library/node_modules/request/request.js:198:22)
    at emitTwo (events.js:106:13)
    at Request.emit (events.js:191:7)
    at Request.&lt;anonymous&gt; (/home/kuno/code/an_api/node_modules/google-auth-library/node_modules/request/request.js:1057:14)
    at emitOne (events.js:101:20)
    at Request.emit (events.js:188:7)
    at IncomingMessage.&lt;anonymous&gt; (/home/kuno/code/an_api/node_modules/google-auth-library/node_modules/request/request.js:1003:12)
    at emitNone (events.js:91:20)
    at IncomingMessage.emit (events.js:185:7)
  code: 404,
  errors: [ { domain: 'global', reason: 'notFound', message: 'Not Found' } ] }
</code></pre>

<p>Sample error #2:</p>

<pre><code>{ Error: Requested entity was not found.
    at Request._callback (/home/kuno/code/an_api/node_modules/google-auth-library/lib/transporters.js:85:15)
    at Request.self.callback (/home/kuno/code/an_api/node_modules/google-auth-library/node_modules/request/request.js:198:22)
    at emitTwo (events.js:106:13)
    at Request.emit (events.js:191:7)
    at Request.&lt;anonymous&gt; (/home/kuno/code/an_api/node_modules/google-auth-library/node_modules/request/request.js:1057:14)
    at emitOne (events.js:101:20)
    at Request.emit (events.js:188:7)
    at IncomingMessage.&lt;anonymous&gt; (/home/kuno/code/an_api/node_modules/google-auth-library/node_modules/request/request.js:1003:12)
    at emitNone (events.js:91:20)
    at IncomingMessage.emit (events.js:185:7)
  code: 404,
  errors: 
   [ { message: 'Requested entity was not found.',
       domain: 'global',
       reason: 'notFound' } ] }
</code></pre>

<p>When I try to reach these messages directly from Gmail (browser app) this is how they look like:</p>

<p><a href="https://i.stack.imgur.com/DNdey.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/DNdey.png" alt="enter image description here"></a></p>

<p>Attachment is an empty <code>.txt</code> file. Note it is sent from (void) and sent to (void) on year 1970.</p>

<p>What are those messages? Why do they appear? How to filter/ignore/delete them?</p>