Outlook | Windows | New Outlook for Windows | For business
Using New Outlook on Windows for professional communication and productivity
What does this mean?
issue with sending email in outlook giving following error code : cf24
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(128, 8%, 22%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EA%3C/text%3E%3C/svg%3E)
Anonymous
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.
85 answers
Sort by: Most helpful
-
Anonymous
2024-06-24T02:53:09+00:00 -
Anonymous
2024-06-23T22:32:14+00:00 I have solved the problem !
New Outlook only works with Server 'smtps.numericable.fr' which is mandatory (with a "S")
It was not clear at all at SFR/Numericable since 'smtp.numericable.fr' is used for Courier W10 for a long time
Sometimes, they say one or the other is indifferent. Yes but for Courier W10 only in fact !!!!!!!!!!!!!!!!!!!!!!!
The 2 servers are in fact not configured, the same, and one of the 2 does not support New Outlook.
Just a ascertainment
-
Anonymous
2024-05-10T02:01:07+00:00 I have Microsoft 356 Personal.
I can no longer send an email nor reply to an email on my Android phone. I can receive emails on my Android phone.
I can receive, send, reply and forward emails on my desktop.
The emails I try to reply to come back undeliverable, Failure Code CF24
Please assist me in correcting this.
Elaine
-
Anonymous
2024-05-09T17:26:18+00:00 Same error for me that just started 1 hour ago. This is May 9, 2024. Unbelievable that this has been an issue for so long!
-
Anonymous
2024-05-03T14:51:07+00:00 I used Microsoft Outlook Help: Contact Support. They told me to remove the account and add it back using "Sync directly with IMAP" That fixed my problem. I hope it fixes yours.