यदि कोई ईमेल लिखा जाता है लेकिन किसी प्राप्तकर्ता को भेजा नहीं जाता है, तो वह सामान्यतः किस फ़ोल्डर में सहेजा (store) जाता है?

A Gmail feature used to postpone emails and temporarily remove them from your inbox until you need them is called ________.

Regarding the username part of an email address (the part before the '@' symbol, e.g., 'JohnDoe' in JohnDoe@example.com), how do most modern email standards and providers handle case sensitivity?