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One bad tenant can sink your whole email platform: what I learned building a reputation circuit breaker
Published on October 20, 2026By DEV Community
I'm a solo founder in the UK building SentriSend, a security gateway that sits in front of transactional email (AWS SES / Resend). This week I shipped two features. Building them changed how I think about multi-tenant email, so here's what I learned. The problem nobody sees: subscription bombing Bots push a victim's address into hundreds of signup forms at once. The victim's inbox floods, and every site involved picks up complaints and spam-trap hits. The nasty part is that each individual site
Read the full article: https://dev.to/danby/one-bad-tenant-can-sink-your-whole-email-platform-what-i-learned-building-a-reputation-circuit-5067
Source: DEV Community