Resources
Guides
Four pieces, each about something we had to solve to build this. They are longer than a blog post and shorter than documentation, and none of them exist to rank for a keyword.
01the set
All guides
- Authentication · 8 min
SPF, DKIM and DMARC
Three DNS records, three different claims. What SPF checks, what DKIM signs, why DMARC needs alignment rather than just a pass, and which of them Infrabox publishes for you.
- Credentials · 7 min
Why app passwords are a dead end
App passwords need 2-step verification, 2-step verification can only be enabled by the user, and a brand-new Workspace user cannot sign in without a phone. The full chain, and what it forces.
- Credentials · 8 min
Domain-wide delegation
One service account, authorised once per Workspace, impersonating any mailbox on demand. Why that scales where app passwords do not, and what it costs you in blast radius.
- Sending · 9 min
Connecting your sending tool
What to type into Instantly, Smartlead or Lemlist, what the relay does with a message once it has it, and how to read the error codes it sends back.
02why only four
Why there are only four
Because these are the four things we actually know something about that is not already written down better elsewhere. Each one came out of a problem that had to be solved to make mailbox provisioning work unattended, and each says what did not work as well as what did.
There is no content calendar behind this page and there will not be a hundred articles on it. If you want the practical version — what happens when a mailbox fails, who owns the domain, what you need before you start — the FAQ answers those directly.
Next
Tell us what you need to send.
How many mailboxes, on how many domains, and which tool you send with. We will tell you what it costs and what the pipeline will do with it.