SimpleVerifier

SimpleVerifier is an email verification service for people who send cold email, newsletters and sales outreach. Upload a list (CSV or any file with an email column), and SimpleVerifier asks each address's mail server whether the mailbox exists. This is an SMTP check: no email is ever sent to the address. Every row comes back valid, risky or invalid, with the mail server's own reason, so you can see why an address failed instead of trusting a bare score. Catch-all domains are handled honestly. A domain that accepts mail for any address can't confirm a single mailbox, so SimpleVerifier never marks those addresses valid. They stay risky and are graded higher, medium or lower likelihood, with the reasons listed. You decide how much risk to send to. Disposable addresses, role accounts, syntax errors and domains with no mail server are flagged too. What you get: - Bulk list verification in the dashboard, with downloadable results that keep your original columns. - Single-address checks for quick lookups. - A public REST API for verifying at signup or inside your own tools (docs at simpleverifier.com/docs/api). - An MCP server at simpleverifier.com/api/mcp, so AI assistants and agents such as Claude, ChatGPT and Cursor can verify emails and check phone number formats directly (docs at simpleverifier.com/docs/mcp). - Integrations with Instantly, Smartlead and Zapier, so you can clean a list before it reaches your sending tool. - An email finder and website enrichment on Pro and above, under fair use. - Phone checks: a format and number-type check on every plan, and live carrier lookups with the phone add-on. - Free tools that need no account, including a bulk domain availability checker, an email provider lookup and a Gmail address checker. Plans start at $9 a month, and one-time packs from $15 never expire. Try it on your own list first. Sign in with Google and your first 100 email checks are free, with no card, on the same engine the paid plans use. Fees are non-refundable once charged, so test before you buy. You can cancel anytime from Billing.

SimpleVerifier checks email addresses and phone numbers in contact lists. For email, it checks syntax, mail-server records and mailbox responses through SMTP, then labels each row valid, risky or invalid with a reason. Phone checks cover format, country and number type; paid live lookups can also report carrier and line type. The service helps cold emailers, marketers and agencies identify addresses that may bounce before sending, while marking unconfirmed addresses as risky rather than valid. A user uploads a CSV containing an email or phone column, or pastes addresses into the verifier. SimpleVerifier checks email syntax, MX records and the mailbox through an SMTP conversation; phone checks examine format, country and number type. Results include a valid, risky or invalid status and the reason, while original columns are retained. Users can download each result group as a separate CSV. The page also describes connecting supported services by API key, using a REST API, and accessing an MCP server. The page describes SimpleVerifier as a tool for cold emailers, marketers and agencies cleaning lists before sending. It is also presented for teams that verify contacts in campaign and CRM tools, or use CSV files and developer integrations. The product distinguishes itself by reporting addresses that cannot be confirmed as risky rather than valid, and by offering monthly email verification plans with fair-use speed tiers. Phone format checks are included, with live carrier lookups available on an added plan.