Why It Matters
Mass email is the backbone of email marketing. It's how brands reach thousands (or millions) of subscribers with a single campaign. But ISPs are watching closely. Send to a dirty list or skip authentication, and you'll tank your sender reputation fast. The line between legitimate mass email and spam is entirely about consent and relevance.
How It Works
You compose one message, select your recipient list, and the email platform handles distribution. Behind the scenes, the platform staggers delivery across IP addresses, manages throttling, processes bounces, and tracks engagement. Most providers enforce sending limits -- if you're on a shared IP, you might be capped at 50,000-100,000 emails per day.
The key difference between mass email and spam? Permission. Every recipient on your list should have explicitly opted in. That's not just good practice -- it's the law in most jurisdictions (CAN-SPAM, GDPR, CASL).
Quick Tips
- Segment your list so you're sending relevant content, not blasting everyone with the same generic message
- Warm up new IPs gradually -- jumping from 0 to 100k emails in a day is a red flag for ISPs
- Always include a visible, working unsubscribe link; hiding it just increases spam complaints