doc,email-validator: document the new NULLMX handling

[email-validator.git] / email-validator.cabal

diff --git a/email-validator.cabal b/email-validator.cabal
index 6627128b23fd5e7a16422d88872275cc8bd4eaea..3e975f393b92cdbfefb234883f2640d4cf97de25 100644 (file)
--- a/email-validator.cabal
+++ b/email-validator.cabal
@@ -23,10 +23,13 @@ description:
     * A syntax check using a regular expression, or the full RFC 5322
       grammar (see the @--rfc5322@ option).
 
-    * Confirmation of the existence of an @MX@ record for the domain part of
-      the address. This is not required; in fact many domains accept mail
-      via an @A@ record for e.g. example.com which is used in lieu of an @MX@
-      record. This behavior can be controlled via the @--accept-a@ flag.
+    * Confirmation of the existence of an @MX@ record for the domain
+      part of the address. NULLMX (RFC7505) records are not
+      accepted. This is not required; in fact many domains accept mail
+      via an @A@ record for (say) example.com which is used in lieu of
+      an @MX@ record. This behavior can be controlled via the
+      @--accept-a@ flag, but note that @--accept-a@ is ignored for
+      domains that have NULLMX records.
 
   These checks are performed in parallel using the number of available
   threads. To increase the number of threads, you can pass the