Technical articles on DNS, networking and IP infrastructure
Showing posts tagged #email ✕ clear
If your emails suddenly bounce or land in spam, your server's IP address may be on a DNS blacklist. Learn how these lists work, how to check them and how to get delisted for good.
Reverse DNS turns an IP address back into a hostname. It is optional for most servers but essential for mail servers. Learn how PTR records work, who controls them and how to check yours.
SPF, DKIM and DMARC are three DNS records that decide whether your emails are trusted or end up in spam. This guide explains each one in plain language and shows how to check and fix them.