VanHalenLover: it was an assumption that the isp deleted the E-mail and that it could not be corrected by the user.
Not reliably corrected.
VanHalenLover: I'd like to see examples of it happening when it is NOT a user defined option
Set up and administer your own email server and you will get to see so many examples that your head will spin. Email providers very often use 2-tier filters, and they very often mistakenly reject the receipt of legitimate email on the first level, so that the email is deleted and the user is not notified in any way that the email was sent to them, and of course it's not located in the user's Spam folder either.
VanHalenLover: You are blaming the isp for something that is most likely an option that can be turned on or off.
No, it cannot.
Also, don't confuse "ISPs" (???) with email providers. The two terms are completely different and in the case of webmail such as Hotmail here, completely unrelated to one another.
("ISP" is most commonly understood as "Internet access provider", and when troubleshooting email mis-deliveries, it's dangerous to conflate the term with email providers, especially when it can happen that one's ISP, specifically their SMTP servers or simply their IP addresses, might be the reason that one's emails fail to get delivered, quite independently from what email addresses one may be sending emails to or from!)