Outlook Express. An unknown error has occurred

By DaireMacAdaim
Mar 20, 2015
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  1. Hello everyone,
    I am using Outlook Express and when im trying to send emails I get this error:
    "An unknown error has occurred. Account: 'Scoil Eimear', Server: '', Protocol: SMTP, Server Response: '421 4.7.0 Not allowed.', Port: 25, Secure(SSL): No, Server Error: 421, Error Number: 0x800CCC67"
    Please help me to fix this error.
  2. jobeard

    jobeard TS Ambassador Posts: 9,147   +597

    That's a temporary, transient SERVER condition,
    421 The service is unavailable due to a connection problem: it may refer to an exceeded limit of simultaneous connections, or a more general temporary problem. The server (yours or the recipient's) is not available at the moment, so the dispatch will be tried again later.

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