Email not sending when attachment is more than 2MB

[Priya-Sparkout]

When we try to send an email with attachment more than 2MB, it returns 500 error. Email not sent.

local.INFO: follow-up-mail-exception :Client error: POST https://graph.microsoft.com/v1.0/users/no-response@****.uk/messages/AAMkAGQ5YzYwNjU0LTBmNWYtNDFlMy04ODBjLWQ0MTdiYTJiNDM5NQBGAAAAAAAQpE2kGSDcRoF3xAfu_FpYBwBNhkxlBc_OTLBwEPhyfj0zAAAAAAEPAABNhkxlBc_OTLBwEPhyfj0zAAE_MPghAAA=/attachments resulted in a 400 Bad Request response:
{"error":{"code":"ErrorMessageSizeExceeded","message":"The message exceeds the maximum supported size., Cannot save changes made to an item to store."}}