... layer down. First, the + is the fragile part of reply+<run_id>@, not the run_id. Plus-addressing is honored by Gmail but a meaningful slice of services and corporate relays either reject + localparts as invalid or "normalize" them by stripping everything after the plus when they sanitize the address. The moment a service cleans reply

... products. They lose them because follow-ups live in their head. I was juggling conversations across: X LinkedIn Product Hunt Reddit DMs Everything was scattered. Warm leads. Beta users. Potential customers. I kept telling myself: I ll replylater.