Email problems. I have error code 5.7.520

Richard Cooper 20 Reputation points
2026-06-20T10:44:28.6033333+00:00

I tried to send an email to a friend yesterday from my iPad and it said it could not send. I now don’t seem to be able to send or receive emails. I contacted Apple who looked into the problem and they said the issue wasn’t with the iPad but Microsoft had blocked my account with Error Code 5.7.520 which is something to do with spam detection. How do l recover my account and start sending and receiving my emails. Thanks Richard Cooper

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SD - IA 179.8K Reputation points Independent Advisor
2026-06-25T15:27:54.2166667+00:00

Thanks for doing the steps - any luck with it?

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  1. SD - IA 179.8K Reputation points Independent Advisor
    2026-06-24T15:41:09.6566667+00:00

    Thanks, pretty much helpful.

    Do you use any signature?

    Second, try switching the Email to Plain Text instead of HTML as a troubleshooting step to verify.

    The setting is below:

    1. Open The Gear icon > Settings.
    2. Go to Mail > Compose and Reply.
    3. Change the message format to Plain text.

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  2. SD - IA 179.8K Reputation points Independent Advisor
    2026-06-22T01:21:00.5533333+00:00

    I see, thanks. I also note that the error code is related to an organization. I want to cross check with a screenshot of the bounce back message, could you post the same?

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