Unable to send email to gmail accounts

This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:

  alokbunty2002@gmail.com
    host gmail-smtp-in.l.google.com [142.250.102.27]
    SMTP error from remote mail server after pipelined end of data:
    550-5.7.26 This mail is unauthenticated, which poses a security risk to the
    550-5.7.26 sender and Gmail users, and has been blocked. The sender must
    550-5.7.26 authenticate with at least one of SPF or DKIM. For this message,
    550-5.7.26 DKIM checks did not pass and SPF check for [sunlightitsolutions.com]
    550-5.7.26 did not pass with ip: [66.96.187.6]. The sender should visit
    550-5.7.26  https://support.google.com/mail/answer/81126#authentication for
    550 5.7.26 instructions on setting up authentication. k11-20020aa7d8cb000000b00532c909a05csi3288675eds.253 - gsmtp

Reporting-MTA: dns; bosmailout06.eigbox.net

Action: failed
Final-Recipient: rfc822;alokbunty2002@gmail.com
Status: 5.0.0
Remote-MTA: dns; gmail-smtp-in.l.google.com
Remote-MTA: X-ip; [142.250.102.27]
X-Remote-MTA-smtp-greeting: X-str; 220 mx.google.com ESMTP k11-20020aa7d8cb000000b00532c909a05csi3288675eds.253 - gsmtp
X-Remote-MTA-helo-response: X-str; 250-mx.google.com at your service, [66.96.187.6]
X-Exim-Diagnostic: X-str; SMTP error from remote mail server after pipelined end of data: 550-5.7.26 This mail is unauthenticated, which poses a security risk to the\n550-5.7.26 sender and Gmail users, and has been blocked. The sender must\n550-5.7.26 authenticate with at least one of SPF or DKIM. For this message,\n550-5.7.26 DKIM checks did not pass and SPF check for [sunlightitsolutions.com]\n550-5.7.26 did not pass with ip: [66.96.187.6]. The sender should visit\n550-5.7.26  https://support.google.com/mail/answer/81126#authentication for\n550 5.7.26 instructions on setting up authentication. k11-20020aa7d8cb000000b00532c909a05csi3288675eds.253 - gsmtp
Diagnostic-Code: smtp; 550-5.7.26 This mail is unauthenticated, which poses a security risk to the
 550-5.7.26 sender and Gmail users, and has been blocked. The sender must
 550-5.7.26 authenticate with at least one of SPF or DKIM. For this message,
 550-5.7.26 DKIM checks did not pass and SPF check for [sunlightitsolutions.com]
 550-5.7.26 did not pass with ip: [66.96.187.6]. The sender should visit
 550-5.7.26  https://support.google.com/mail/answer/81126#authentication for
 550 5.7.26 instructions on setting up authentication. k11-20020aa7d8cb000000b00532c909a05csi3288675eds.253 - gsmtp

Return-path: <akumar@sunlightitsolutions.com>
Received: from bosmailscan01.eigbox.net ([10.20.15.1])
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    id 1qj45o-000115-AF
    for alokbunty2002@gmail.com; Wed, 20 Sep 2023 16:46:40 -0400
DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed;
    d=sunlightitsolutions.com; s=dkim; h=Sender:Content-Type:Message-ID:Subject:
    To:From:Date:MIME-Version:Reply-To:Cc:Content-Transfer-Encoding:Content-ID:
    Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc
    :Resent-Message-ID:In-Reply-To:References:List-Id:List-Help:List-Unsubscribe:
    List-Subscribe:List-Post:List-Owner:List-Archive;
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    TxfztuLCTc/VT5uCMG4UksOiw110Qu3RBqOT8u3LTPJ1NcvlOMO7hFbOmLrHMlgU7xtPvuMKKCtXu
    73TjVjUDS5aIkz3MuFnslPeqNhtYYmgeFDkBooU6J08/vOgdupZOn0DRP0lDIw7DMJKcE7OFigTvt
    /6odSC0g==;
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    for alokbunty2002@gmail.com; Wed, 20 Sep 2023 16:46:40 -0400
Received: from boswebmail08.eigbox.net ([10.20.16.8])
    by bosimpout13 with
    id oLmc2A0030ASFPu01LmfBr; Wed, 20 Sep 2023 16:46:39 -0400
X-Authority-Analysis: v=2.3 cv=G76H7+s5 c=1 sm=1 tr=0
 a=nrbQDdKp8bIvKAbSIVj10Q==:117 a=/51T4Zu3XoC6ZNQdXJDutw==:17
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Received: from [127.0.0.1] (helo=homestead)
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    for alokbunty2002@gmail.com; Wed, 20 Sep 2023 16:46:31 -0400
Received: from [209.127.197.38]
 by emailmg.homestead.com
 with HTTP (HTTP/1.1 POST); Wed, 20 Sep 2023 16:46:31 -0400
MIME-Version: 1.0
Date: Wed, 20 Sep 2023 15:46:31 -0500
From: Alok Kumar <akumar@sunlightitsolutions.com>
To: alokbunty2002@gmail.com
Subject: test email
Organization: Sunlight IT Solutions
Message-ID: <17fc66afe505698c1df536816e0930ec@sunlightitsolutions.com>
X-Sender: akumar@sunlightitsolutions.com
User-Agent: Roundcube Webmail/1.3.14
Content-Type: multipart/alternative;
 boundary="=_e35c562feedc9eaf1cdf69a365621d0d"
X-EN-AuthUser: akumar@sunlightitsolutions.com
Sender:  Alok Kumar <akumar@sunlightitsolutions.com>
X-EN-Class: impinc