The Buzzmark blog
Notes on deliverability, transactional email, EU data and building a product company in the open.
The Buzzmark Team
SMTP or API? Two Ways to Send with Buzzmark
You can hand mail to Buzzmark over classic SMTP or over an HTTP API. Both reach the same place; the right choice depends on your stack, your existing code, and how much control you want.
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Return-Path, Envelope Sender, and Why Bounces Need a Home
There are two "from" addresses on every email, and most people only know about one. The hidden one — the Return-Path — is where bounces go and where SPF is checked. Here's why it matters.
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Dedicated vs. Shared IPs: Which Do You Actually Need?
Dedicated IPs sound like the professional choice, but for most senders a shared IP is genuinely better. Here's how to tell which side of the line you're on.
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DMARC: From p=none to Enforcement, Safely
Publishing a DMARC record is easy. Reaching an enforcement policy without accidentally blocking your own legitimate mail is the real work. Here's the staged path from monitoring to full protection.
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Suppression Lists: Your Quietest Deliverability Tool
A suppression list is the record of addresses you should never email again. It's unglamorous, it runs in the background, and it's one of the most important safeguards standing between you and a ruined sender reputation.
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