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21 Service Temporarily Unavailable

  • 1.  21 Service Temporarily Unavailable

    Posted Apr 06, 2017 06:15 AM

    Hi All, 

    We send emails to our customers on daily basis and quite alot of them use messagelabs for email service. Since yesterday we have started receiving alerts about mails queueing up in our outbox because they were not delivered to messagelabs. 

    All messages failed with the following error:

    TLS error on connection to cluster5.us.messagelabs.com [216.82.242.34] (recv)  : Error in the pull function

    421 Service Temporarily Unavailable 

    Is it possible that you have some throttling policy for the server that we are using to send emails from?

     

    Regards, 

    Jahan Syed