How to block someone on Gmail who hasn't emailed you
This step-by-step tutorial will show you how to block someone on Gmail who hasn't emailed you.
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On web interface:
1. Settings icon
2. See all settings
3. Filters and Blocked Addresses
4. Create a new filter
5. Enter email address in "From" field
6. Create filter
7. Check "Delete it"
8. Create filter