Bounce back on external email to group

Hello everyone,

Once again, asking for help. I set up a distro group with external email address. When I email the group internally from the domain, it works fine. but if I email the group externally, I get a bounce back. The rejected server is coming from my server. I did set up the group to send to internal and external emails.

*Note: We did upgrade from exchange 2010 to 2016 a month ago and the group is set to send internal and external emails. Not sure what is the causing the issue. Could it be a receive connector

Error message below:

---------- Forwarded message ---------
From: <postmaster@mycompany.com>
Date: Mon, Apr 23, 2018, 10:25 AM
Subject: Undeliverable: Test
To: <kenny.admin@gmail.com>

Delivery has failed to these recipients or groups:
g.c@external.us
Your message wasn't delivered due to a permission or security issue. It may have been rejected by a moderator, the address may only accept e-mail from certain senders, or another restriction may be preventing delivery.
d.c@external.us
Your message wasn't delivered due to a permission or security issue. It may have been rejected by a moderator, the address may only accept e-mail from certain senders, or another restriction may be preventing delivery.
w.w@external.us
Your message wasn't delivered due to a permission or security issue. It may have been rejected by a moderator, the address may only accept e-mail from certain senders, or another restriction may be preventing delivery.
The following organization rejected your message: mail.mycompany.com.


Diagnostic information for administrators:
Generating server:mycompany.com
g.c@external.us
mail.mycompany.com #554 5.7.1 Relaying denied ##
d.c@external.us
mail.mycompany.com #554 5.7.1 Relaying denied ##
w.w@external.us
mail.mycompany.com #554 5.7.1 Relaying denied ##
Original message headers:

Received: from SA-EXDR-P01.mycompany.local (192.168.122.184) by
 BOEX1.mycompany.local (192.168.127.210) with Microsoft SMTP Server (TLS) id
 14.3.382.0; Mon, 23 Apr 2018 10:23:04 -0500
Received: from SA-EX-P01.mycompany.local (192.168.122.241) by
 SA-EXDR-P01.mycompany.local (192.168.122.184) with Microsoft SMTP Server
 (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id
 15.1.1261.35; Mon, 23 Apr 2018 10:23:03 -0500
Received: from mail.mycompany.com (192.168.122.5) by
 SA-EX-P01.mycompany.local (192.168.122.241) with Microsoft SMTP Server
 (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA_P256) id
 15.1.1261.35 via Frontend Transport; Mon, 23 Apr 2018 10:23:04 -0500
Received: from mail-wr0-f177.google.com (mail-wr0-f177.google.com
 [209.85.128.177])      by mail.mycompany.com  with ESMTP id
 w3NFOtLB010583-w3NFOtLD010583      (version=TLSv1.2 cipher=ECDHE-RSA-AES128-SHA
 bits=128 verify=NOT)      for <tigaproject@mycompany.com>; Mon, 23 Apr 2018
 10:24:56 -0500
Received: by mail-wr0-f177.google.com with SMTP id v60-v6so42413595wrc.7
        for <tigaproject@mycompany.com>; Mon, 23 Apr 2018 08:24:56 -0700
 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
        d=gmail.com; s=20161025;
        h=mime-version:from:date:message-id:subject:to;
        bh=nWudKbw3UE7LOU8U1HUxXs+teQDZ8JUUBwrFIrUoiz8=;
        b=PkpodLDtbfKnPphfr3rqbOUh841+2dQX7eHl7Jjgo9IGIwNFtk0HWLz0meaYEVucSX
         JZc9ku7Ap4QW4yYnW7LiIrDwrksRcQpM28yOv2+SzM2sr+JmnBoziwulFF0DF5JLkKTC
         CyXtn9fLkqpZj/AOHFfhPiKd608gq39nDFM/57Atcv0EFqEZJqhkq4aRbUg+HsLmEI/1
         nUSSe6U8qKlcvyEk6QYBjDS6hIifE1izLmsWBzzJ+WWG/3BYh7D4q3bsbmxzGtVz+xhP
         p1S6MPwUBXu+UvoNtk00YNV6snEjdDQPyRXArrXJ/c3FtwLa4hzluHKe7glil1Zy3poH
         OCzQ==
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
        d=1e100.net; s=20161025;
        h=x-gm-message-state:mime-version:from:date:message-id:subject:to;
        bh=nWudKbw3UE7LOU8U1HUxXs+teQDZ8JUUBwrFIrUoiz8=;
        b=lL1myleEL3y4Up6hXxFmm2Xne720TWIT9t2pbFhv08GPRvoVnUwgpBmKoZvjXG5J4l
         tufFJaoRg97zYtYliFqNePCFzRBfB3UG0dYO/gTYHsJUMSWjWWegV5NzFOTjTAsTJLhR
         K22EcaRIfiG/B45wLENOib28vdGA4a32WgGr7EH5v787eMudJxgDCevmXPuRVgdwrsLJ
         iSO4vweVB4/SqZf+T4Y4PjyVdHeDTnUptUoDBqEyviCU7qWiqV4lNtwErxKRB5uiATr0
         DX1cm73cxcHyjHPYTP3gUeV1mS3Bo24vzMiJ8/nZ/5dj3GAkP1FCU7hRaougFHRQDIzJ
         mnQg==
X-Gm-Message-State: ALQs6tBzKUy9dloUftDVvAtfJr7/G3tufNDSbPxtonp25rqZBFMxIS7d
      pjLg+ec26yeuY2GpEPVuuncmGd8lG5/iD70qG3U=
X-Google-Smtp-Source: AIpwx4/w13L9YbByZR3pRvMNXwSP2LOr2xI3DCmE1MFrjDkK5H4ELarzn6AKnqCY+B9zSsaS3q/iCO/Q3udKOaczH18=
X-Received: by 10.167.197.83 with SMTP id s19mr11893642edr.139.1524497094976;
 Mon, 23 Apr 2018 08:24:54 -0700 (PDT)
MIME-Version: 1.0
From: Kenny Placido <Kenny.admin@gmail.com>
Date: Mon, 23 Apr 2018 15:24:44 +0000
Message-ID: <CAPxCpbS5ZvMtHdZ_8N-YNi-NQK=tk_3evQ9ebVTVF_C4B6ZNxA@mail.gmail.com>
Subject: Test
To: <tigaproject@mycompany.com>
Content-Type: multipart/alternative; boundary="883d24f6aed4ceaa90056a85a362"
X-FEAS-SPF: pass, ip=209.85.128.177, helo=mail-wr0-f177.google.com, mailFrom=kenny.admin@gmail.com
X-FEAS-DKIM: Valid
Authentication-Results: mail.mycompany.com;
      spf=pass (mycompany.com: domain of kenny.admin@gmail.com designates 209.85.128.177 as permitted sender) smtp.mailfrom=kenny.admin@gmail.com;
      dkim=pass header.i=@gmail.com
Return-Path: kenny.admin@gmail.com
X-Auto-Response-Suppress: DR, OOF, AutoReply