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).
 
     * 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
 
   These checks are performed in parallel using the number of available
   threads. To increase the number of threads, you can pass the