Opening unfamiler emails and visiting unknown websites
There are pros and cons to using special characters in email subject lines. Generally, marketers report higher open rates.
Some report better engagement, but many don’t.
There are also reports of special characters causing problems with deliverability, mostly because spammers became very fond of special characters for a while.
Straight
Curvilinear
Rectilinear
You can use the following command Bootrec /rebuildbcd