SimpleVerifier checks each email address the way a mail server would: it connects to the recipient's server, asks whether the mailbox exists, then disconnects before anything is sent. Upload a CSV or check one address, and every row comes back valid, risky or invalid with the reason and send advice. Valid means the mail server confirmed the mailbox. Catch-all domains, role addresses and providers that hide mailbox status stay risky, never guessed valid, and catch-alls are graded higher, medium or lower likelihood with the reasons. It also flags disposable domains, typos and duplicates, and checks MX, SPF, DKIM, DMARC and blocklists for your sending domains.
Pricing is monthly, not credits. Starter is $9 a month for 2,500 checks. Pro is $39 a month with no cap and no per-email fees. Fair use: the first 100,000 checks a month run at full speed, then big lists run in a paced lane, never cut off. Business ($99) and Agency ($249) raise the full-speed volume to 300,000 and 750,000 a month and add 5 or 15 seats, a priority lane, and on Agency, client workspaces and branded client reports. One-time packs start at $15 for 10,000 checks and never expire. The first 100 checks are free with a Google sign-in, no card. Cancel anytime; fees are non-refundable once charged.
Pro and up add an email finder and website enrichment (fair use), a REST API (10,000 calls a month on Pro, then $1.50 per 1,000) and a remote MCP server so agents in Claude, ChatGPT, Cursor and VS Code can verify addresses directly. It connects to Instantly, Smartlead, HubSpot and Mailchimp by API key and tags each contact with its result. Phone numbers get a free format and number-type check; Pro + Phone ($49.99 a month) adds 5,000 live carrier lookups a month.
What it doesn't do: no sending, no warm-up, no inbox placement tests.
