recipient valdation RSS

1

hello everyone! We have the exchange 2010 + orf setup, and there's a question. A lot of spam like this passes through ORF - the email has, lets say, 10 recipients, but only 1 email is valid on our mailserver - but still, this message is recognized as non-spam and hits the "valid" recipient.

Is there a problem in recipient configuration?

by Alexandr Gromotkov 7 years ago
2

@Alexandr Gromotkov: The recipient validation feature stops emails sent to non-existent recipients only: just because an email has multiple recipients of which some are non-existent, it does not necessarily mean it's spam and should not be delivered to valid recipients, so such behavior of the recipient validation feature would block many legitimate emails. (Imagine a client of yours sending an email an Cc:-ing somebody who no longer works for your firm).

ORF has another test, which relies on recipient validation and does exactly what you need: the DHA protection test. This test will ban senders for X minutes who sent Y emails to non-existent addresses within Z minutes (all three values can be configured). By default, it will ban senders for 24 hours who send emails to 3 non-existent addresses within 3 hours, so false positives are unlikely to occur.

The test can be enabled and configured in the Administration Tool (Configuration / Tests / Tests and Configuration / Tests / DHA protection test pages).

by Krisztian Fekete (Vamsoft) 7 years ago
(in reply to this post)

New comment

Fill in the form below to add a new comment. All fields are required. If you are a registered user on our site, please sign in first.

Nickname:
Email address (will not be published):
Your comment:

ORF Technical Support

Configuring, installing and troubleshooting ORF.

News & Announcements

Your dose of ORF-related news and announcements.

Everything but ORF

Discuss Exchange and system administration with fellow admins.

Feature Test Program

Feature Test Program discussion. Membership is required to visit this forum.

ORF Beta

Join the great bug hunt of the latest test release.

Customer Service

Stay Informed