Outlook email Sending' reported error (0x800CCC69): 'The server responded: 550 5.7.1 [Moderator Note: Personal Info Removed]

Question

Outlook email Sending' reported error (0x800CCC69): 'The server responded: 550 5.7.1 [Moderator Note: Personal Info Removed]

Mark Trichet 5

Hi I have Outlook 2013 installed using Office V15.

Outlook will receive emails but wont send emails. Error message says:

Sending' reported error (0x800CCC69) : ' The server responded: 550 5.7.1 [Moderator Note: Personal Info Removed]

SMTP settings are correct for BIGPOND

Please help

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Answer 1

Chloe-V 5,920 Microsoft External Staff Moderator

Hi Mark Trichet,

Thank you for reaching out to Microsoft Q&A forum.

Please note that our forum is a public platform, and we will modify your question to hide your personal information in the description. Kindly ensure that you hide any personal or organizational information the next time you post an error or other details to protect personal data.

To help me quickly troubleshoot the email sending incident, could you please provide the following information:

The Windows version you are using (for example: Windows 7, Windows 10, or Windows 11).
The SMTP port and encryption method you have tried:
- 465 / SSL
- or 587 / STARTTLS
The most recent SMTP response message displayed in Outlook when attempting to send an email (you may copy and paste the full message via private message).

Additionally, if convenient, please let me know:

Whether you are able to send emails successfully when signing in via your email provider’s Webmail.

Once I have this information, I will review it and get back to you with the next steps as soon as possible.

Mark Trichet 5 Reputation points

2026-02-10T02:54:24.8633333+00:00

Hi Chloe

I am using Windows 10, 22H2

SMTP is 587 TLS (no option for STARTTLS, only SSL/TLS/None or Auto)

POP3 995 incoming server.

Recent error message is:

Task '[Moderator Note: Personal Info Removed]@bigpond.com - Sending' reported error (0x800CCC69) : ' The server responded: 550 5.7.1 [Moderator Note: Personal Info Removed]'

I can successfully send from Telstra webmail.

Regards

[Moderator Note: Personal Info Removed]
Chloe-V 5,920 Reputation points Microsoft External Staff Moderator

2026-02-10T09:06:57.3+00:00
Hi Mark Trichet,

Thanks for the details. The “550 5.7.1” response means the SMTP server is rejecting the submission due to an authentication/permission policy.

First, can you please try changing the network to see if the incident still persists.

If not, please kindly follow these steps to see how everything goes:

1. On Outlook:

Go to File > Account Settings > Your Account > More Settings > Outgoing Server tab > tick “My outgoing server (SMTP) requires authentication” and “Use same settings as my incoming mail server.”

2. Set Telstra’s recommended SMTP path

Server: smtp.telstra.com

Advanced tab > set SMTP = 465 + SSL/TLS (recommended).

If you prefer 587, choose the option that corresponds to STARTTLS in your dialog

Please feel free to let me know if you have any further updates, thank you.
Chloe-V 5,920 Reputation points Microsoft External Staff Moderator

2026-02-11T07:02:36.46+00:00

Hi Mark Trichet,

May I know if you have got any chance to check my answer? I am glad to help if you have any other questions.

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Outlook email Sending' reported error (0x800CCC69): 'The server responded: 550 5.7.1 [Moderator Note: Personal Info Removed]

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