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.
