Gmail messages not reaching my Tiscali and TalkTalk inboxes

[NeilM]

My main personal email is with Tiscali, but I have another with Gmail, for matters connected to a sailing club that I am a flag officer. Up to now, there has been no problem with sending messages between these two accounts. However, starting suddenly on Monday, any messages that I send from the Gmail account fail to get through.

I get the following response

550 5.7.1 Connection refused - [209.85.160.65] blocked by Validity....... and a link to some kind of blocking list of IP addresses. 

I have sent test messages to most of my regular correspondents and it looks as if may of them do not have a problem. It seems to be my Tiscali account and my wife's TalkTalk account that are involved. None of my other correspondents are with TalkTalk/Tiscali.

I cannot make sense of this.  The quoted IP address appears to be connected to Google.  I cannot find any explanation of "Validity". I have looked at recent posts in the TT Community, but nothing seems relevant. Help.

Cheers

Neil

[Mandisa-TT]

Hi @NeilM I’m sorry for the inconvenience. I wanted to let you know that your incident has been included in the list of known issues concerning Gmail and Hotmail emails going to spam. Our technical team is actively investigating the situation, and we’ll provide you with updates as soon as we have more information. Thank you for your understanding!

[fr8ys]

Issues with Gmail and Hotmail emails going to spam, both sent and received is an issue TalkTalk are aware of.

It has been referred to the backroom technical team to investigate and when staff return tomorrow I'm sure your incident will be added to the known issues.