Saturday, 5 September 2026Directory: The tool for the task.70 tools · 36 official sources
70 tools in 10 tasks. Each says what it is for, what it costs, and whether it is the official source.
find.doThe tool for the task.
◆ marks the regulator, registry or test maker. The steps that use these tools are on for.do.
Send email that lands · Portal · Global

Google email sender guidelines◆

The rules Gmail applies to bulk senders — authentication, unsubscribe, spam rate.

Price
free
Official source
support.google.com
Reviewed
5 Sept 2026
Open support.google.com ↗

What it is for

Knowing the thresholds (DMARC, one-click unsubscribe, spam complaints under 0.3%) before sending at volume.

deliverability · Gmail

Used in these playbooks