[technical-issues] Banning .xyz email from my company's servers

Olivier MJ Crepin-Leblond ocl at gih.com
Wed Mar 16 08:48:29 UTC 2016


Hello all,

this is just to let you know that after being flooded with 980 spam
emails from a myriad of .XYZ email addresses, I have taken the
unprecedented step of blocking the top level domain .XYZ from our email
servers. The flood has been sustained for the past couple of months and
for some reason, the emails manage to go through our regular filters
like SpamAssassin, as well as various DNS block lists.

Since my company's main servers run Postfix, I did the following:
/
///etc/postfix/main.cf//
//
//smtpd_sender_restrictions = check_sender_access
regexp:/etc/postfix/blocked_tlds//
//
//
///etc/postfix/blocked_tlds//
//
//### block sender access from the following spammy top-level domains//
///\.xyz$/       REJECT  Top Level Domain .xyz banned due to spam/


We have not received any more significant amount of spam from the
domains listed on https://www.spamhaus.org/statistics/tlds/ therefore we
have not added them to our blocking list yet, but if any significant
amount of spam starts coming in from them, we'll add them to the
blocking list too.

Being a strong supporter of Universal Acceptance of TLDs, I am sad to
have had to reach this point but also being the bill payer in my
company, I could not allow the bandwidth taken nor the time taken by
readers of emails to delete this daily flood of spam from their Inbox.
It is sad that the unwillingness of the domain name industry to subject
themselves to standards of behaviour leads to domains that are
completely untrustable and that need to be treated as a pest rather than
an asset to the Internet.

Kindest regards,

Olivier

-- 
Olivier MJ Crépin-Leblond, PhD
http://www.gih.com/ocl.html



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