Invite Neighbors with Postcards

## User Feedback

**Type:** Feature
**Submitted by:** marc@cull.ventures
**Priority:** P1

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I'd like to be able to invite my neighbors with postcards, because I don't know their email addresses.

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_What a charming idea! We'll look into making this happen for you._

**Internal Notes:**
- Auto-generated from feedback form
- User should receive email updates on this issue
