Exibir código-fonte para Bloqueando SPAM no e-mail

em /etc/postfix/body_checks.pcre adicione
 /lotofácil/     DISCARD
 /Cidadania Italiana/     DISCARD

Rode o comando
<source lang="bash">
postmap /etc/postfix/body_checks.pcre
</source>

e reinicie o postfix
<source lang="bash">
service postfix restart
</source>

pode testar assim
<source lang="bash">
postmap -q "lotofácil" pcre:/etc/postfix/body_checks.pcre
</source>

ou criando um arquivo assim
 To: test@seudominio.com.br
 Subject: sendmail test two
 From: test@seudominio.com.br
 
 And here goes the e-mail body, test test test.. lotofácil

e rode o comando
<source lang="bash">
sendmail -vt < mensagem-de-teste.txt
</source>

== Referências ==
* https://www.cyberciti.biz/faq/howto-blacklist-reject-sender-email-address/
* http://serverfault.com/questions/728641/blacklisting-tld-in-postfix
* http://www.linuxquestions.org/questions/linux-server-73/how-to-reject-addresses-by-tld-in-postfix-678757/
* https://www.linuxbabe.com/mail-server/block-email-spam-check-header-body-with-postfix-spamassassin
* https://serverfault.com/questions/667268/postfix-2-9-or-sendmail-outgoing-spam-prevention-check-if-sender-exists
https://clients.javapipe.com/knowledgebase/132/How-to-Test-Sendmail-From-Command-Line-on-Linux.html