SpamAssassin rule
HELO_DYNAMIC_IPADDR
Server introduced itself with a dynamic-looking name
+3.243 points
Combination of other tests (meta rule)
What HELO_DYNAMIC_IPADDR means
The HELO host name of the sending server looks like a dynamic IP address.
The rule's description in SpamAssassin: “Relay HELO'd using suspicious hostname (IP addr 1)”
How to fix it
Configure the mail server to use a proper host name (mail.yourdomain.com) in HELO, matching its reverse DNS.
With 3.243 points this rule alone uses more than a third of the 5.0-point spam threshold, so fixing it matters.
Does your email trigger HELO_DYNAMIC_IPADDR?
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Open the email spam checkerRelated rules
FORGED_GMAIL_RCVDGmail address sent through non-Gmail servers
FREEMAIL_FORGED_REPLYTOFree-mail Reply-To on a different From
FREEMAIL_FROMSent from a free email address
FREEMAIL_REPLYTODifferent free-mail addresses in From and Reply-To
FROM_FMBLA_NEWDOMFrom domain registered in the last 7 days
FROM_FMBLA_NEWDOM14From domain registered in the last 14 days
FROM_FMBLA_NEWDOM28From domain registered in the last 28 days
FSL_HELO_NON_FQDN_1HELO is not a full host name
HEADER_FROM_DIFFERENT_DOMAINSFrom and envelope sender use different domains
Frequently asked questions
What does HELO_DYNAMIC_IPADDR mean?
The HELO host name of the sending server looks like a dynamic IP address.
How do I fix HELO_DYNAMIC_IPADDR?
Configure the mail server to use a proper host name (mail.yourdomain.com) in HELO, matching its reverse DNS.
How many points does HELO_DYNAMIC_IPADDR add?
3.243 points in the default SpamAssassin ruleset (network tests on, Bayes off). A message is treated as spam from 5.0 points. Mail servers can change scores locally.