Outlook Express. An unknown error has occurred

By DaireMacAdaim
Mar 20, 2015
Post New Reply
  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: 'scanner.scoilnet.ie', 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: 11,174   +989

    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.

Similar Topics

Add your comment to this article

You need to be a member to leave a comment. Join thousands of tech enthusiasts and participate.
TechSpot Account You may also...