My sister has an Ipad and an Iphone and lives in the UK. She uses Yahoo for her email and has a free account like most people. Had the same address for years She says that every time I send her an email with a link to youtube.com (American Address) content she is deluged with spam emails from the US. I have a private email with Hostgator and get very little spam (due to the filters) down to my Outlook.
So, she told me to stop sending them and deletes any email I send with a US link in it.
Can anyone explain why this happens?