add From, To and Date header in smtp payload

[Issif]

Signed-off-by: Thomas Labarussias issif_github@gadz.org

What type of PR is this?

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/kind bug

/kind cleanup

/kind design

/kind documentation

/kind failing-test

/kind feature

Any specific area of the project related to this PR?

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What this PR does / why we need it:

Add headers to SMTP payload to avoid to trigger Antispam (Amavis)

Content-Type: multipart/alternative; boundary=4t74weu9byeSdJTM
Date: Mon Sep 05 11:17:34 +0000 2022
From: sender@test.com
MIME-version: 1.0
Message-ID: eRLbKi-tUeoWDSSmeho7nHjlsb9EoygIGrzH22YAsS8=@mailhog.example
Received: from localhost by mailhog.example (MailHog)
          id eRLbKi-tUeoWDSSmeho7nHjlsb9EoygIGrzH22YAsS8=@mailhog.example; Mon, 05 Sep 2022 11:17:34 +0000
Return-Path: <sender@test.com>
Subject: [Debug] This is a test from falcosidekick
To: recipident@test.com

Which issue(s) this PR fixes:

#363

Fixes #

Special notes for your reviewer:

[poiana]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: fjogeleit, Issif

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[poiana]

LGTM label has been added.

Git tree hash: 3a1a13736ca16bdb955a9f0410d48a499a24ad85