For marketing teams
Bulk Email Deliverability: Meet the Google and Yahoo Sender Rules on Every Campaign
Since February 2024, bulk senders are graded against explicit rules, not vibes: aligned authentication, one-click unsubscribe, and a spam-rate ceiling. Inboxes makes checking them a step in your campaign calendar, not an annual audit.
Inbox placement
79%
··%
· ·
Authentication
checking 130+ blacklists
Sample data. Seed results are estimates, not guarantees.
Bulk email deliverability, defined
Bulk email deliverability is whether high-volume campaign mail reaches inboxes at scale, and since 2024 it has explicit rules attached. Google and Yahoo require senders of 5,000+ messages a day to authenticate with aligned SPF or DKIM and a DMARC policy, offer one-click unsubscribe, and keep reported spam rates below 0.3%, with Microsoft enforcing similar requirements for Outlook since 2025. Miss them and mail gets filtered or rejected outright, regardless of how good the campaign is. Inboxes turns compliance into a repeatable pre-send step: test the campaign against live mailboxes at Gmail, Outlook, Yahoo, iCloud, GMX, and Zoho, get a pass or fail on each bulk-sender requirement, and get remaining fixes ranked by impact. Between campaigns it monitors reputation, 130+ blacklists, and DMARC reports across every domain you send from. Seed tests are directional estimates, and no tool can promise the inbox, but they make "are we compliant for this send" a two-minute question.
Why it fits
Built for the way you send
Make pre-send testing a calendar step
Add a placement test to the campaign checklist next to proofreading and link checks. It takes minutes, and it is the difference between finding an Outlook spam problem on Tuesday and finding it in Friday's campaign report.
Track the 0.3% line before Google does
The spam-rate threshold is the rule teams break without noticing, one aggressive re-engagement send at a time. Reputation monitoring and DMARC report parsing show the trend early, while it is still a segmentation fix instead of a domain problem.
One view across every domain you send from
Brand domain, product domain, events subdomain: each has its own auth, reputation, and blacklist exposure. Inboxes monitors them all in one place, so the domain nobody owns is still a domain somebody watches.
// Who this fits
In-house marketing and lifecycle teams running a real campaign calendar at bulk-sender volume, on any ESP, who need compliance and placement checked per send instead of assumed.