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Added a caution note about the checkMX option #10437

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Oct 8, 2018
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Added a caution note about the checkMX option #10437

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5 changes: 5 additions & 0 deletions reference/constraints/Email.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -117,6 +117,11 @@ checkMX
If true, then the :phpfunction:`checkdnsrr` PHP function will be used to
check the validity of the MX record of the host of the given email.

.. caution::

This option is not reliable because it depends on the network conditions
and some valid servers refuse to respond to those requests.

checkHost
~~~~~~~~~

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