This will return all emails sent by the current user, by the contact whose ID is fa300a0e-0ad1-b322-9601-512d0983c19a, using the email address sam@example.com, which is referenced by the ID b0701501-1fab-8ae7-3942-540da93f5017, or by the lead whose ID is 73b1087e-4bb6-11e7-acaa-3c15c2d582c6 using the email address wally@example.com, which is referenced by the ID b651d834-4bb6-11e7-bfcf-3c15c2d582c6.

{
  "filter": [{
    "$from": [{
      "parent_type": "Users",
      "parent_id": "$current_user_id"
    }, {
      "parent_type": "Contacts",
      "parent_id": "fa300a0e-0ad1-b322-9601-512d0983c19a"
    }, {
      "email_address_id": "b0701501-1fab-8ae7-3942-540da93f5017"
    }, {
      "parent_type": "Leads",
      "parent_id": "73b1087e-4bb6-11e7-acaa-3c15c2d582c6",
      "email_address_id": "b651d834-4bb6-11e7-bfcf-3c15c2d582c6"
    }]
  }]
}

Equivalent to:

{
  "filter": [{
    "from_collection": {
      "$in": [{
        "parent_type": "Users",
        "parent_id": "$current_user_id"
      }, {
        "parent_type": "Contacts",
        "parent_id": "fa300a0e-0ad1-b322-9601-512d0983c19a"
      }, {
        "email_address_id": "b0701501-1fab-8ae7-3942-540da93f5017"
      }, {
        "parent_type": "Leads",
        "parent_id": "73b1087e-4bb6-11e7-acaa-3c15c2d582c6",
        "email_address_id": "b651d834-4bb6-11e7-bfcf-3c15c2d582c6"
      }]
    }
  }]
}

This would return all archived emails received by the current user.

{
  "filter": [{
    "$or": [{
      "$to": [{
        "parent_type": "Users",
        "parent_id": "$current_user_id"
      }],
      "$cc": [{
        "parent_type": "Users",
        "parent_id": "$current_user_id"
      }],
      "$bcc": [{
        "parent_type": "Users",
        "parent_id": "$current_user_id"
      }]
    }]
  }, {
    "state": {
      "$in": [
        "Archived"
      ]
    }
  }]
}

Equivalent to:

{
  "filter": [{
    "$or": [{
      "to_collection": {
        "$in": [{
          "parent_type": "Users",
          "parent_id": "$current_user_id"
        }]
      },
      "cc_collection": {
        "$in": [{
          "parent_type": "Users",
          "parent_id": "$current_user_id"
        }]
      },
      "bcc_collection": {
        "$in": [{
          "parent_type": "Users",
          "parent_id": "$current_user_id"
        }]
      }
    }]
  }, {
    "state": {
      "$in": [
        "Archived"
      ]
    }
  }]
}

This would return all archived emails sent by a contact to the current user.

{
  "filter": [{
    "$from": [{
      "parent_type": "Contacts",
      "parent_id": "fa300a0e-0ad1-b322-9601-512d0983c19a"
    }]
  }, {
    "$or": [{
      "$to": [{
        "parent_type": "Users",
        "parent_id": "$current_user_id"
      }],
      "$cc": [{
        "parent_type": "Users",
        "parent_id": "$current_user_id"
      }],
      "$bcc": [{
        "parent_type": "Users",
        "parent_id": "$current_user_id"
      }]
    }]
  }, {
    "state": {
      "$in": [
        "Archived"
      ]
    }
  }]
}

Equivalent to:

{
  "filter": [{
    "from_collection": {
      "$in": [{
        "parent_type": "Contacts",
        "parent_id": "fa300a0e-0ad1-b322-9601-512d0983c19a"
      }]
    }
  }, {
    "$or": [{
      "to_collection": {
        "$in": [{
          "parent_type": "Users",
          "parent_id": "$current_user_id"
        }]
      },
      "cc_collection": {
        "$in": [{
          "parent_type": "Users",
          "parent_id": "$current_user_id"
        }]
      },
      "bcc_collection": {
        "$in": [{
          "parent_type": "Users",
          "parent_id": "$current_user_id"
        }]
      }
    }]
  }, {
    "state": {
      "$in": [
        "Archived"
      ]
    }
  }]
}