Possible way to bypass SPF Test? RSS

1

I was reviewing the logs today and found this warning:

Error checking the SPF policy of domain "interestsfreedom.com": SPF policy syntax error. Source "interestsfreedom.com", message "Multiple SPF declarations were found with the same version." at character -1.

Would setting up a bogus SPF policy for a particular domain that causes the SPF test to fail be a way spammers are trying to bypass SPF tests?

The IP & domain name for the server that sent the spam was:

93.174.94.204 (93-174-94-204.constellationservers.net)

by Josh 5 years ago
2

@Josh: If the sender domain has a bogus / syntactically incorrect SPF record (or, like in this case, multiple SPF records with the same version), ORF will simply skip the SPF test (as it is not possible to determine whether the sender host is authorized to send emails in the name of the domain or not) and proceeds with the rest of the tests. The email will not be excluded from other tests, so it is not possible to bypass filtering this way.

The SPF aims to prevent email forgery, so it helps when a spammer tries to spoof a legitimate, trusted domain. If the domain name in the sender address is bogus or controlled by the spammer (i.e., the spammer can set up an SPF record for it), the SPF test will not be of any use.

by Krisztián Fekete (Vamsoft) 5 years ago
(in reply to this post)

3

Thanks for the reply Krisztian!

by Josh 5 years ago

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Email address (will not be published):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