Getting 404 no message found for message ID - IMAP grants.

When working with IMAP grants, Nylas will return the message header ID as the Nylas message ID in both webhook payload and GET /v3/grants/{grant_id}/messages endpoint. This differs from the other providers like Google and Microsoft. The returned message header ID can contain special characters as + and # which may cause issues when making subsequent requests.

Example of Nylas Response for IMAP grants containing the message header ID looks like this:

"from":[
   {
      "email":"test@nylas.com",
      "name":"Test Nylas"
   }
],
"grant_id":"fe44***********165b",
"id":"<CAO9+SefMZ1WGUv**************l.gmail.com>",
"object":"message",
"reply_to":[
   {
      "email":"test@nylas.com"
   }
],

Problem

Message header IDs can contain special characters (e.g. +, #). When these IDs are included directly in the GET /v3/grants/{grant_id}/messages/<message-header-id> endpoint, Nylas may return a 404 error due to improper handling of these special characters.

Solution

As a best practice, Nylas suggests always URL-encoding the message ID when performing a message lookup for IMAP accounts. This ensures that special characters are correctly interpreted GET /v3/grants/{grant_id}/messages/<encoded-message-header-id>

By ensuring that message IDs are properly URL-encoded, you can avoid 404 errors when accessing messages through the GET /v3/grants/{grant_id}/messages/<message-header-id> endpoint. This simple step ensures that special characters are correctly interpreted, leading to successful retrieval of the messages.

Resources

• Return a Message

Updated June 05, 2024 12:05