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

Locked Question. This question was migrated from the Microsoft Support Community. You can vote on whether it's helpful, but you can't add comments or replies or follow the question.

0 comments

85 answers

Sort by: Most helpful
Most helpful Newest Oldest
  1. 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

    Was this answer helpful?

    0 comments
  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

    Was this answer helpful?

    0 comments
  3. 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

    Was this answer helpful?

    0 comments
  4. Deleted

    This answer has been deleted due to a violation of our Code of Conduct. The answer was manually reported or identified through automated detection before action was taken. Please refer to our Code of Conduct for more information.

    Comments have been turned off. Learn more

  5. Anonymous
    2024-04-08T15:42:43+00:00

    I am having the same issue, can you please help?

    Technical details

    SmtpSubmissionPermanentException: Smtp submission failed. Server 'smtp.gmail.com' Port '587'. --> Unexpected SMTP server response. Expected: 235, actual: 334, whole response: 334 eyJzdGF0dXMiOiI0MDAiLCJzY2hlbWVzIjoiQmVhcmVyIiwic2NvcGUiOiJodHRwczovL21haWwuZ29vZ2xlLmNvbS8ifQ==

    Failure code: cf24

    Was this answer helpful?

    0 comments