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  1. smtpd_recipient_restrictions = reject_invalid_hostname,
  2. reject_unknown_recipient_domain,
  3. reject_unauth_destination,
  4. reject_rbl_client sbl.spamhaus.org,
  5. permit
  6.  
  7. smtpd_helo_restrictions = reject_invalid_helo_hostname,
  8. reject_non_fqdn_helo_hostname,
  9. reject_unknown_helo_hostname
  10.  
  11. smtpd_client_restrictions = reject_rbl_client dnsbl.sorbs.net
  12.  
  13. relayhost = [<public server IP through OpenVPN>]
  14.  
  15. smtpd_helo_required = no
  16.  
  17. Sep 2 15:53:53 HomeServer sm-mta[6677]: t82Drr6w006677: from=sys@mydomain.com, size=69, class=0, nrcpts=1, msgid=<201509021353.t82Drr6w006677@HomeServer.blablabla_crappyRouter>, proto=ESMTP, daemon=MTA-v4, relay=localhost [127.0.0.1]
  18. Sep 2 15:53:53 HomeServer sm-mta[6679]: STARTTLS=client, relay=mydomain.com., field=cn_subject, status=failed to extract CN
  19. Sep 2 15:53:53 HomeServer sm-mta[6679]: STARTTLS=client, relay=mydomain.com., field=cn_issuer, status=failed to extract CN
  20. Sep 2 15:53:53 HomeServer sm-mta[6679]: STARTTLS=client, relay=mydomain.com., version=TLSv1/SSLv3, verify=FAIL, cipher=ECDHE-RSA-AES256-GCM-SHA384, bits=256/256
  21. Sep 2 15:53:53 HomeServer sm-mta[6679]: t82Drr6w006677: to=info@mydomain.com, delay=00:00:00, xdelay=00:00:00, mailer=esmtp, pri=120069, relay=mydomain.com. [93.186.192.197], dsn=4.7.1, stat=Deferred: 450 4.7.1 <HomeServer.blablabla_crappyRouter>: Helo command rejected: Host not found
  22.  
  23. ehlo localhost
  24. mail from: sys@mydomain.com
  25. rcpt to: info@mydomain.com
  26. data
  27. Subject: My first mail on Postfix
  28.  
  29. Hi,
  30. Are you there?
  31. regards,
  32. Admin
  33. .
  34. quit
  35.  
  36. cat mail.txt | nc localhost 25
  37.  
  38. smtpd_helo_restrictions = reject_invalid_helo_hostname,
  39. reject_non_fqdn_helo_hostname,
  40. reject_unknown_helo_hostname
  41.  
  42. smtpd_helo_restrictions =
  43. permit_mynetworks,
  44. reject_invalid_helo_hostname,
  45. reject_non_fqdn_helo_hostname,
  46. reject_unknown_helo_hostname
  47.  
  48. smtpd_delay_reject = yes
  49.  
  50. mua_helo_restrictions =
  51. permit_sasl_authenticated,
  52. reject_unknown_helo_hostname
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