8000 minor #10437 Added a caution note about the checkMX option (javieregu… · symfony/symfony-docs@bcfc3de · GitHub
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minor #10437 Added a caution note about the checkMX option (javiereguiluz)
This PR was merged into the 2.8 branch. Discussion ---------- Added a caution note about the checkMX option Some users on Slack asked for an explicit mention about how unreliable is this option. Commits ------- 7910bf4 Added a caution note about the checkMX option
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‎reference/constraints/Email.rst

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@@ -117,6 +117,11 @@ checkMX
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If true, then the :phpfunction:`checkdnsrr` PHP function will be used to
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check the validity of the MX record of the host of the given email.
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.. caution: 5DA7 :
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This option is not reliable because it depends on the network conditions
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and some valid servers refuse to respond to those requests.
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checkHost
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~~~~~~~~~
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