Mail delivery failed: returning message to sender

[Singnet Mail Delivery System]

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:

  kayan@enviroserv.co.za
    host za-smtp-inbound-2.mimecast.co.za [41.74.197.201]
    SMTP error from remote mail server after end of data:
    554 Email rejected due to security policies - https://community.mimecast.com/docs/DOC-1369#554 [8ZmzZhr4N7mjyWOEOWNGtw.za30]
  kay.kahan@mibco.org.za
    host aspmx.l.google.com [142.251.12.26]
    SMTP error from remote mail server after RCPT TO:<kay.kahan@mibco.org.za>:
    550-5.1.1 The email account that you tried to reach does not exist. Please try
    550-5.1.1 double-checking the recipient's email address for typos or
    550-5.1.1 unnecessary spaces. Learn more at
    550 5.1.1  https://support.google.com/mail/?p=NoSuchUser o16si31316934pgu.270 - gsmtp
  kay1@worldonline.co.za
    host securemail-mx3.synaq.com [196.35.198.130]
    SMTP error from remote mail server after RCPT TO:<kay1@worldonline.co.za>:
    550-rejected because 13.251.197.89 is in a black list at combined.abusix.dnsbl
    550 https://lookup.abusix.com/search?q=13.251.197.89
  kay.ghfc@mweb.co.za
    host securemail-mx3.synaq.com [196.35.198.130]
    SMTP error from remote mail server after RCPT TO:<kay.ghfc@mweb.co.za>:
    550-rejected because 13.251.197.89 is in a black list at combined.abusix.dnsbl
    550 https://lookup.abusix.com/search?q=13.251.197.89
  kayakazi.bam@vodacom.co.za
    host cluster5.eu.messagelabs.com [195.245.230.201]
    SMTP error from remote mail server after RCPT TO:<kayakazi.bam@vodacom.co.za>:
    550 Invalid recipient <kayakazi.bam@vodacom.co.za> (#5.1.1)
  kayahm@ave.co.za
    all hosts for 'ave.co.za' have been failing for a long time (and retry time not reached)
  kay_xu@goodfarmer.com
    host mxbiz1.qq.com [203.205.232.191]
    SMTP error from remote mail server after RCPT TO:<kay_xu@goodfarmer.com>:
    550 Mailbox not found. http://service.exmail.qq.com/cgi-bin/help?subtype=1&&id=20022&&no=1000728
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From: "BEN JOHNSON" <mauve-patches@sourceware.org>
Subject: WARM REGARDS
Date: Mon, 29 Nov 2021 15:07:46 +0800
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