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

I am having the same issue with a BT email account. All messages bounce back in New Outlook but not in Outlook (old)

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 52.98.150.29

Failure code: cf24

I experience the same issue with one of my Outlook accounts:

Technical details

SmtpSubmissionPermanent5XXException: Smtp submission failed. Server 'mx3.pub.mailpod11-cph3.one.com' Port '25'. --> Unexpected SMTP server response. Expected: 334, actual: 503, whole response: 503 5.5.1 Error: authentication not enabled

Failure code: cf24

Best,

Henning Jon Grini

I have that SAME response and NOTHING has changed on my end.

Same issue here, failure code cf24. Nothing changed for me either.

Jen

Hello Mohammed EL BERRAH,

Good day! Thank you for reaching out.

I'm sorry to hear that you're experiencing issues with sending emails in Outlook. Please let me know of the following to better assist. Thanks in advance.

1. What is the type of account you are using? Is it an MN3656 work/school account or a Microsoft/personal account like Gmail/Hotmail/outlook.com?
2. Is this happening to all emails or to specific senders?

In the meantime, please verify whether you can successfully send emails when you log into outlook on the web. This will; help narrow down if the issue is with the app or the account itself.

Also, if you are using an IMAP account and you have recently changed my email password, please update your email account password via the Outlook Account screen. You can also try to remove and re-add the account again.

Looking forward to your response.

Best Regards,

Ashraf.

Same code here.