SpamAssassin rule
FSL_HELO_NON_FQDN_1
HELO is not a full host name
+0.001 points
Header test
What FSL_HELO_NON_FQDN_1 means
The sending server introduced itself with a short name instead of a fully qualified domain name.
How to fix it
Set the server's HELO/EHLO name to a full host name such as mail.yourdomain.com.
This rule adds almost nothing to the score by itself. It matters only together with other rules.
Does your email trigger FSL_HELO_NON_FQDN_1?
Send it to a free test address: we run SpamAssassin, check SPF, DKIM and DMARC and show every rule with a fix.
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
HEADER_FROM_DIFFERENT_DOMAINSFrom and envelope sender use different domains
HELO_DYNAMIC_IPADDRServer introduced itself with a dynamic-looking name
Frequently asked questions
What does FSL_HELO_NON_FQDN_1 mean?
The sending server introduced itself with a short name instead of a fully qualified domain name.
How do I fix FSL_HELO_NON_FQDN_1?
Set the server's HELO/EHLO name to a full host name such as mail.yourdomain.com.
How many points does FSL_HELO_NON_FQDN_1 add?
0.001 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.