Guides
Guides
Straight answers to the email problems people actually search for. Written by the team that runs the sending, the DNS and the reply inbox.
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Pay for emails you send, not contacts you keep
Why per-contact pricing punishes a growing list, and how to compare plans by what you actually send.
Updated 6 Oct 2026Your list can grow. Your bill doesn't have to.
A worked example: the list grows six times over and the monthly bill stays the same.
Updated 6 Oct 2026
Honest metrics
Every reply, read
Campaigns
Deliverability fixes
How to read a DMARC report
What each part of a DMARC aggregate report means, and what to do about what you find.
Updated 6 Oct 2026Unknown IPs in your DMARC report: spoofing or a forgotten sender?
How to tell a forgotten sender, a forwarder and a spoofer apart in your DMARC report.
Updated 6 Oct 2026550 5.7.26: why Gmail rejected your email
What Gmail's 550 5.7.26 bounce means and the three records that fix it.
Updated 6 Oct 2026SPF and DKIM pass but DMARC fails
Why DMARC needs aligned domains, not just passing checks, and how to fix it.
Updated 6 Oct 2026