topic Re: Receiving Emails From Plusnet Accounts in Email

Receiving Emails From Plusnet Accounts

PhilS100 — Sat, 31 Jan 2026 14:23:17 GMT

Hello - My sister's ISP is Plusnet, and TalkTalk is blocking her emails to me - I think the error code is 550 5.7.1. The email address is in my Safe Senders list. How can I tell TalkTalk not to block a particular address, even if it doesn't like the ISP? The actual address is independent of the ISP, so it's not the visible domain which is the problem. Many thanks.

Re: Receiving Emails From Plusnet Accounts

Mandisa-TT — Mon, 02 Feb 2026 07:04:57 GMT

Hi @PhilS100 I will look into your query and assist you.

Re: Receiving Emails From Plusnet Accounts

Mandisa-TT — Mon, 02 Feb 2026 07:18:48 GMT

@PhilS100 Thanks for your post. The error code 550 5.7.1 usually means the sending mail server has been blocked by our platform due to a security or reputation issue on their side — it’s not related to your Safe Senders list.

There’s nothing you need to change on your account, but your sister’s email provider (Plusnet) will need to check their outgoing mail server and request delisting if it’s been flagged. They can do this by contacting their own support team to investigate the rejection and resolve the server reputation issue.