host mx6.mail.icloud.com [126.96.36.199]
SMTP error from remote mail server after MAIL FROM:email@example.com SIZE=2369:
550 5.7.0 Blocked - see https://support.proofpoint.com/dnsbl-lookup.cgi?ip=188.8.131.52
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:
host mx3.hotmail.com [184.108.40.206]
SMTP error from remote mail server after MAIL FROM:firstname.lastname@example.org SIZE=2214:
550 SC-001 (SNT004-MC11F16) Unfortunately, messages from 220.127.116.11 weren't sent. Please contact your Internet service provider since part of their network is on our block list. You can also refer your provider to http://mail.live.com/mail/troubleshooting.aspx#errors.
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