Blog
Notes from the infrastructure side
Practical, short and specific.
SPF, DKIM and DMARC: a checklist before you send anything
The five checks that catch most authentication problems, in the order to do them.
- DNS
- Authentication
Why a new IP address needs a warm-up
Mailbox providers have no history for a new IP. Here is what they look at and how a ramp builds trust.
- Deliverability
- PowerMTA
What a blacklist listing actually means
Not every listing is equal. How to tell a serious one from noise and what to do next.
- Blacklists
- Monitoring