Backscatter: The Bounces You Never Sent
When spammers forge your domain as their envelope sender, the bounces come to you. What backscatter is, why it happens, and how to stop causing and receiving it.
#MTA
4 articles with this tag
Greylisting, Tarpitting, and Other Receiver Defenses Senders Should Understand
Receiving servers defend themselves with deliberate delays, temporary rejections, and traps for impatient senders. How each defense works and how a good MTA passes them.
Bounce Classification: Hard, Soft, and What Your Handling Logic Gets Wrong
Hard versus soft is not enough. How SMTP codes, enhanced status codes, and provider quirks should drive your retry, suppression, and reputation logic.
Throttling and Deferrals: Reading 4xx Responses as Rate Limits
A 4xx is not a failure, it is a negotiation. How to tell greylisting from reputation throttling, and the retry behaviour that recovers instead of escalating.