issue with sending email in outlook giving following error code : cf24

Anonymous
2024-02-17T12:01:06+00:00

bonjour,

Technical details

SmtpSubmissionPermanent5XXException: Smtp submission failed. Server 'smtp.hostinger.com' Port '465'. --> Unexpected SMTP server response. Expected: 235, actual: 535, whole response: 535 5.7.8 Error: authentication failed: UGFzc3dvcmQ6

Failure code: cf24

Outlook | Windows | New Outlook for Windows | For business

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  1. Anonymous
    2024-04-10T16:13:18+00:00

    Original message details
    Created date: 4/10/2024 4:11:18 PM
    Sender address: ******@out.com
    Recipient addresses: ******@email.com
    Subject: After 2020 email

    Technical details 

    SmtpSubmissionPermanent5XXException: Smtp submission failed. Server 'mail.privateemail.com' Port '465'. --> Unexpected SMTP server response. Expected: 235, actual: 535, whole response: 535 5.7.8 Error: authentication failed: UGFzc3dvcmQ6
 
Failure code: cf24

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  2. Anonymous
    2024-04-16T13:27:32+00:00

    Same issue

    Technical details SmtpSubmissionPermanent5XXException: Smtp submission failed. Server 'exten.nazwa.pl' Port '465'. --> Unexpected SMTP server response.  Expected: 235, actual: 535, whole response: 535 5.7.0 Authentication error - 0402   Failure code: cf24

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  3. Anonymous
    2024-04-25T13:49:11+00:00

    I also have the same problem. After switching to Outlook last year everything worked well, but over the last 3 months or so I regularly get the undeliverable message below. Sometimes I can send successfully and sometimes not. It seems random and getting worse. I have a btinternet email address.

    I'm not that great at tech so please advise.

    Thanks

    Trevor

    Technical details

    SmtpSubmissionPermanent5XXException: Smtp submission failed. Server 'mail.btinternet.com' Port '465'. --> Unexpected SMTP server response. Expected: 235, actual: 535, whole response: 535 invalid user ID or password from 52.98.158.253

    Failure code: cf24

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  4. Anonymous
    2024-04-26T03:57:04+00:00

    已经4月26日了，这个问题困扰了我整整一天，微软团队能不能行了，修复这个bug对你们工程师来说很难吗？

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  5. Anonymous
    2024-04-29T16:57:30+00:00

    same problem

    Technical details

    SmtpSubmissionPermanent5XXException: Smtp submission failed. Server 'mail.b.hostedemail.com' Port '465'. --> Unexpected SMTP server response. Expected: 250, actual: 550, whole response: 550 5.7.1 Message detected as spam. [1714366816-457409].

    Failure code: 21f5

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