FAQ
Email deliverability FAQ: straight answers, including the uncomfortable ones
This niche is full of guarantees nobody can keep. Here is what Inboxes does, what it will not do, and how the testing actually works.
It diagnoses why they go to spam and gives you ranked, concrete fixes: authentication records, blacklist delistings, reputation and list-hygiene changes, content flags. Most senders find fixable causes on the first test. What it will not do is promise placement: nobody can guarantee the inbox, and you should distrust any tool that does. We show you what is wrong and how to fix it; the sending and the reputation stay yours.
No. Inboxes runs no warmup network, no bot opens, no automated replies, and no spam-folder rescues. Those tactics fake engagement signals, violate provider policies, and have been actively shut down by Gmail and Microsoft enforcement since 2023. Inboxes is diagnostics, monitoring, and fixes you make yourself, which is safe under the Gmail, Yahoo, and Microsoft bulk-sender rules.
The seed panel covers the mailboxes real audiences use: Gmail (including the Promotions tab), Outlook and Hotmail, Yahoo, iCloud, GMX, Zoho and more, with extended B2B seeds on higher plans. A placement test sends to about 30 to 80 real mailboxes depending on your plan and reads where each copy landed.
A seed test is a directional estimate, not a replica of your exact audience. Mailbox providers personalize filtering per recipient, so no seed list can mirror your subscribers precisely. What it reliably shows is systematic problems: failed authentication, a blacklist hit, a template that trips filters, a provider that routes you to spam wholesale. That is what you need to find and fix, and we say this plainly in our methodology.
No. Inboxes works alongside any ESP: Mailchimp, Klaviyo, SendGrid, Postmark, Amazon SES, HubSpot, Braze, or your own SMTP. You send the test from your normal setup, because that is the setup being judged by the mailbox providers. Nothing to migrate, nothing to install.
No. Inboxes is for legitimate senders delivering wanted email: newsletters, transactional messages, and marketing to your own opted-in list. We do not help unsolicited bulk email get delivered, and we decline signups that are about that. If your list opted in and your mail is wanted, this is for you.
Four flat plans: Solo at $29, Growth at $79, Scale at $159, and Agency at $349 per month, with about two months off on yearly billing. No credit packs, no per-test fees, no sales call, and you can cancel from your account at any time. The plans differ by domains, tests per month, seed-panel size, and monitoring volume.
Your sending stays in your ESP; we never send on your behalf. We store your test results, the headers of emails you send to the seed list, and the DMARC reports you route to us, and we use them only to produce your reports and alerts. You can delete your data at any time. We do not sell data, run ads, or share your results.
// The honest boundary
Nobody can guarantee inbox placement: not us, not an agency, not a warmup network. Mailbox providers personalize filtering per recipient and change the rules without notice. What a good tool can do is find the systematic problems (failed authentication, blacklist hits, reputation damage, template flags), tell you how to fix them, and monitor so regressions get caught early. That is the whole product. If someone promises you the inbox, that is the signal to leave.
Still unsure? Read the email deliverability guide, compare deliverability tools honestly, or ask us directly.