Unable to Send Email — Webmail Shows 550 5.7.1, SMTP Won’t Connect. (Receiving Works)

Michael146 — Wed, 21 Jan 2026 12:50:18 GMT

Subject: Unable to Send Email — Webmail Shows 550 5.7.1, SMTP Won’t Connect (Receiving Works)

Message:

Hello,
I need help with my TalkTalk email account as I am currently unable to send any emails at all, from any device or platform.

Summary of the Problem

I can receive incoming emails normally.
But I cannot send emails using:
- TalkTalk Webmail
- Gmail app on my phone (using my TalkTalk account)
The problem persists across all devices and networks.

What Happens on Webmail
When using TalkTalk Webmail on the website, any email I try to send (even to myself, and even a simple plain-text message) fails with:
550 5.7.1 – Reject for policy reason
This indicates a server-side policy block or filtering rejection.

What Happens on My Phone (Gmail App)

I updated my TalkTalk password on the phone.
I can receive email, so authentication is correct.
When sending, the email stays stuck in the Outbox.
SMTP settings are correct:
Server: smtp.talktalk.net
Port: 587
Security: STARTTLS
Gmail returns: “Couldn’t open connection to server.”

This means the Gmail app is unable to make an SMTP connection to TalkTalk’s server on port 587.

Important Timeline Detail

The 550 5.7.1 rejection on Webmail occurred BEFORE I changed my password, so the sending block is not caused by the password change.
The SMTP connection failure on my phone is happening after the error appeared through Webmail, which suggests a single underlying cause.

What I Believe Is Happening
Given that Webmail cannot send, SMTP on 587 cannot connect, port 465 also fails, and receiving works fine, I believe that my outbound sending has been blocked by TalkTalk’s email platform, likely due to a policy filter or security rule triggered on my account.

What I Need
Could you please check:

Whether my TalkTalk email account has been blocked or restricted from sending
Whether there is a policy rule, security flag, or anti-spam filter currently applied to my account
Whether the outbound SMTP service for my account can be reset or unblocked
Whether there is any issue affecting smtp.talktalk.net on port 587 for my specific mailbox

Thank you very much for your help.

Re: Unable to Send Email — Webmail Shows 550 5.7.1, SMTP Won’t Connect. (Receiving Works)

Thabile-TT — Wed, 21 Jan 2026 12:58:12 GMT

Hi there @Michael146 thank you for reaching out I'll take a look at this shortly.

Re: Unable to Send Email — Webmail Shows 550 5.7.1, SMTP Won’t Connect. (Receiving Works)

Thabile-TT — Wed, 21 Jan 2026 13:15:17 GMT

Could you please let me know if your home internet connection is stable and functioning well?

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Unable to Send Email — Webmail Shows 550 5.7.1, SMTP Won’t Connect. (Receiving Works)

Re: Unable to Send Email — Webmail Shows 550 5.7.1, SMTP Won’t Connect. (Receiving Works)

Re: Unable to Send Email — Webmail Shows 550 5.7.1, SMTP Won’t Connect. (Receiving Works)