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System Design for Python Juniors
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Module 6 · Real-World System Design Cases
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Design email service (SendGrid scale)
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📝 **Question:** Why don't you send from your app server's IP? 📋 Pick the right answer. 💡 **Hint:** Re-read the theory above if unsure.
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📝 **Question:** Why don't you send from your app server's IP? 📋 Pick the right answer. 💡 **Hint:** Re-read the theory above if unsure.
A
You can — most teams run their own postfix on the app server with no measurable deliverability hit at any scale below 10M emails per day.
B
Sending IP reputation is a slow-built moat. Shared/cold IPs land in spam. Email providers (SendGrid, Mailgun, Postmark) bring reputation infrastructure.
C
It is cheaper to send from app servers — SendGrid charges per email above the free tier, and a self-hosted postfix has no per-message marginal cost.
D
AWS Acceptable Use Policy explicitly requires customer email traffic to flow through SES — sending from an EC2 IP without SES triggers automatic account suspension.
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