topic Have I been compromised 550 5.7.1 in Email

Have I been compromised 550 5.7.1

bhbarton — Thu, 23 Oct 2025 23:24:34 GMT

Hi, hoping that someone from support staff can help. Not sure if my email has been blocked for security reasons, maybe because I have been compromised. Receive error message 550 5.7.1 I have changed my password but unable to send mail, recieving fine.

Re: Have I been compromised 550 5.7.1

amahle-TT — Fri, 24 Oct 2025 07:49:48 GMT

Hi there @bhbarton, We apologize for the situation and appreciate your patience as we investigate it. Could you please confirm whether you are unable to send emails to all recipients or if the issue is specific to a certain domain?

Re: Have I been compromised 550 5.7.1

bhbarton — Tue, 11 Nov 2025 23:32:49 GMT

Hi Amahle, very strange,.it seems that I can send emails from my laptop but unable to send from phones, I have two phones using this email and both have stopped sending. I have changed the password, deleted the account and then reloaded it and tried different apps all to no avail?

Re: Have I been compromised 550 5.7.1

mandisa1-TT — Wed, 12 Nov 2025 07:03:48 GMT

Hi there @bhbarton I would love to look into this for you, just to confirm do you have an active TalkTalk account with us?

Re: Have I been compromised 550 5.7.1

bhbarton — Wed, 12 Nov 2025 10:47:55 GMT

Yes I have my broadband with talktalk

Re: Have I been compromised 550 5.7.1

mandisa1-TT — Wed, 12 Nov 2025 11:19:30 GMT

We will need to complete diagnostic checks to detect if there is any fault. Just to confirm are you using webmail?

Re: Have I been compromised 550 5.7.1

bhbarton — Wed, 12 Nov 2025 12:55:57 GMT

I have used webmail this morning to do a test and that has sent. I use aquamail on the phones but have tried outlook and nothing will send from phones. I have deleted the account on the phones and reloaded but still won't send from either phone

Re: Have I been compromised 550 5.7.1

mandisa1-TT — Wed, 12 Nov 2025 14:02:47 GMT

We are unable to assist with third party Apps, as you have confirmed you were able to send a test email on webmail. However we can only try and offer general assistance.

Re: Have I been compromised 550 5.7.1

mandisa1-TT — Wed, 12 Nov 2025 14:07:13 GMT

Can you please confirm if you are using an Android or IOS device?

Re: Have I been compromised 550 5.7.1

bhbarton — Wed, 12 Nov 2025 14:20:37 GMT

Android

Re: Have I been compromised 550 5.7.1

mandisa1-TT — Wed, 12 Nov 2025 14:23:03 GMT

Please check your third-party app settings: Setting up email on an Android device - TalkTalk Help & Support

Re: Have I been compromised 550 5.7.1

bhbarton — Wed, 12 Nov 2025 14:30:29 GMT

My server is imap@tiscali not talktalk as your guide to settings says, it has always been @Tiscali. Have tried the settings on your guide to setting up using @talktalk and that doesn't work either

Re: Have I been compromised 550 5.7.1

mandisa1-TT — Wed, 12 Nov 2025 14:36:38 GMT

As it is working on webmail it seems to be a third-party issue, your settings are correct @ tiscali you can return to them. My advice would be please continue using webmail.

Re: Have I been compromised 550 5.7.1

ferguson — Wed, 12 Nov 2025 15:07:57 GMT

@mandisa1-TT

Should not all TalkTalk mail server settings be mail.talktalk.net for incoming and smtp.mail.talktalk.net for outgoing, regardless of origin?

Re: Have I been compromised 550 5.7.1

mandisa1-TT — Wed, 12 Nov 2025 16:26:39 GMT

That is correct @ferguson, as per the email settings guide, however @bhbarton uses a Tiscali and confirmed his settings have always been imap@tiscali

Re: Have I been compromised 550 5.7.1

ferguson — Wed, 12 Nov 2025 16:30:27 GMT

In which case their settings are wrong!

Re: Have I been compromised 550 5.7.1

ferguson — Wed, 12 Nov 2025 16:33:48 GMT

The username and address may well be abc123@tiscali.co.uk, but not the server settings.

Re: Have I been compromised 550 5.7.1

mandisa1-TT — Wed, 12 Nov 2025 16:35:37 GMT

I understand @ferguson however this is a third-party issue, as @bhbarton confirmed webmail is working correctly with the current settings and has also tried the settings on the guide however she still cannot send emails using the third-party app. However I would appreciate any advice from you on this

Re: Have I been compromised 550 5.7.1

ferguson — Wed, 12 Nov 2025 16:38:33 GMT

No worries @mandisa1-TT, they need to set up the server details exactly as shown in the help article and reiterated by myself above.

Re: Have I been compromised 550 5.7.1

mandisa1-TT — Wed, 12 Nov 2025 16:41:32 GMT

Thank you for the support @ferguson 🙂