Send & Receive Issues

How to Fix Outlook Emails Rejected by BigPond Addresses

Olivia Miller Oct 10, 2026 869 views

Question details

The user needs to resolve an issue where emails sent from Outlook to BigPond email addresses are bouncing back with non-delivery reports.

How to Fix Outlook Emails Rejected by BigPond Addresses

Product: Microsoft Outlook
Device & OS: not provided
Scenario: Sending emails to recipients with BigPond email addresses.
Observed behavior: Outlook messages sent to BigPond recipients return a non-delivery report (NDR) indicating rejection, while messages sent to other domains are successfully delivered.

Before you start

Locate and open the non-delivery report (NDR) email you received, as it contains the specific error code (such as 550 5.7.1) needed to identify the exact reason the recipient's server blocked your message.

Solution 1Recommended

Review the NDR and Contact the Recipient

Identify the rejection code from the non-delivery report and ask the recipient to investigate the block with their email provider.

BigPond's mail servers have strict security and policy rules. If your email is flagged as spam or fails security checks, the server will block it and return a non-delivery report (NDR) to your Outlook inbox.

Since the block is happening on the recipient's end, changing your local Outlook settings generally will not resolve the issue.

Open the Non-Delivery Report

Navigate to your Outlook inbox and open the bounced email notification (NDR) you received after trying to email the BigPond address.

Locate the Error Code

Scroll through the NDR to find the specific server response code. Look for codes like '550 5.7.1', which indicate that the recipient's server rejected the message due to policy or security settings.

Contact the Recipient Alternatively

Reach out to the BigPond recipient using an alternative method, such as a phone call, text message, or a different email provider (like Gmail or Yahoo).

Request to Whitelist Your Address

Ask the recipient to add your email address to their safe senders list or contact their email provider (Telstra/BigPond) to investigate the rejection code and unblock your domain.

Review the NDR and Contact the Recipient

Understanding Error 550 5.7.1: This specific error code means the recipient's mail server refused to accept the connection because your IP address, domain, or email content triggered their spam filters.

Solution 2

Send the Email from a Different Network

Switching your network connection can assign you a new IP address, which may bypass IP-based blocklists.

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Frequently Asked Questions

Why is the BigPond server blocking my Outlook emails?

BigPond (managed by Telstra) uses aggressive spam filtering policies. If your email contains certain links, has large attachments, or comes from an IP address with a poor sender reputation, the server will reject it for security reasons.

Can I fix this issue by changing my Outlook settings?

Generally, no. The rejection occurs on the recipient's server side, not within your Outlook application. Changing your local settings won't bypass the recipient's spam filters.

What should I do if I keep getting the 550 5.7.1 NDR?

You need to share the NDR with the recipient and ask them to contact their IT support or email provider. The provider must investigate why your domain or IP is blocked and manually whitelist your address.

Outlook & Email Problems