Buyer guide · SimpleVerifier Team
Email verification for law firms
Law firms send client alerts, intake follow-ups and referral-partner updates from a domain that also carries privileged correspondence. Verify those marketing and intake lists before each send so bounces do not build up on the firm's domain. Starter is $9 a month for 2,500 checks, Pro is $39 a month, and the first 100 checks are free.
A firm's domain is a working asset: the same domain that sends a client newsletter also sends engagement letters and filings. A poor sending reputation from a marketing list can slow down both.
The lists themselves are modest in size but old, assembled from intake forms, conference scans, referral partners and a decade of contacts.
SimpleVerifier facts: prices, packs and limits
- What it is
- Email verification with a real SMTP mailbox check: each address comes back valid, risky or invalid with a reason. Includes an email finder on Pro and up.
- Price per check
- Starter $9/mo for 2,500 ($3.60 per 1,000); Pro $39/mo, 100,000 a month at full speed ($0.39 per 1,000 when used), then slower, never cut off. Business $99/mo with 300,000 at full speed; Agency $249/mo with 750,000 at full speed.
- One-time packs
- 10,000 for $15 ($1.50 per 1,000); 25,000 for $29 ($1.16 per 1,000); 50,000 for $49 ($0.98 per 1,000); 100,000 for $79 ($0.79 per 1,000); 250,000 for $169 ($0.68 per 1,000). Credits never expire, run at standard speed, CSV verification only (no API or finder).
- Free checks
- First 100 email checks free with a Google sign-in, no card, once per account. Single checks on the free email checker need no account.
- Billing
- Monthly subscription, cancel anytime (yearly billing optional). One-time packs are listed above. Starter allowances reset monthly and do not roll over.
- Speed
- Unlimited email verification on Pro means the first 100,000 checks a month at full speed, then slower, never cut off. It is not instant: checks are paced and capacity is shared by all customers, so small lists finish sooner, a very large list queues and can take days rather than hours, and every job shows its estimated finish time. Bad syntax, dead domains and disposable addresses return at once.
- Catch-all handling
- Catch-all (accept-all) addresses stay risky, never valid, and are graded higher, medium or lower likelihood with the reasons. Anything a mail server does not confirm is risky.
- API and MCP
- REST API on Pro, Business and Agency (Pro includes 10,000 calls a month, then $1.50 per 1,000). Remote MCP server with 6 tools for Claude, ChatGPT, Cursor and VS Code. No API on Starter.
- Integrations
- Connects to Instantly, Smartlead, HubSpot and Mailchimp by API key: verifies a campaign or list and tags each contact with its result. CSV in and out for any other tool.
- Phone
- Free phone format checks (country, type range). Live carrier and line-type lookups come with Pro + Phone at $49.99/mo (5,000 a month). It never says a number is in service.
- Privacy and GDPR
- Data processing agreement countersigned on request (/dpa). Results files deleted 7 days after a list is submitted; confirmed results cached by address for 14 days. Lists are not used for marketing, sold or shared. Verification runs on a US server. No GDPR certification is claimed.
- What it does not do
- No sending, warmup or inbox placement tests. No published accuracy benchmark against other verifiers. Catch-all domains, Yahoo and AOL cannot be confirmed, and Outlook.com and Hotmail mailboxes are not probed while Microsoft refuses checks from our server's network: all of these come back risky, never valid.
SimpleVerifier facts from our pricing page and product. Last updated .
Test it on a real address first
Type any address. It gets the same check the paid plans run: syntax, the domain’s mail servers and, where the provider allows it, a live mailbox check. Nothing is sent to the address.
Five checks a minute, no account needed. Nothing is sent to the address — we ask its mail server whether the mailbox exists, then disconnect.
Have a list? Sign in with Google and the first 100 addresses are checked free, with results to download. No card.
By continuing you agree to our Terms and Privacy Policy.
What goes wrong in a firm's lists
Intake forms attract throwaway addresses from people who are not ready to commit, and a consultation follow-up to a dead address looks like silence from the firm.
Referral-partner and past-client lists are rarely pruned. Partners move firms, and a corporate address that worked at the last conference may bounce now.
Firms often use a separate domain for marketing mail precisely to protect the main one, but a high bounce rate can hurt that domain's reputation too, and then marketing mail stops landing in inboxes.
What to run, and what stays out
Verify the newsletter and referral lists quarterly and intake leads before the follow-up. Valid addresses go on the send list; invalid addresses are queued for a call; risky addresses at accept-all corporate domains are sent in a smaller wave.
Matter files and client names are not needed for the check. Upload a CSV with the email column only, and follow your confidentiality duties for anything else.
Every result is valid, risky or invalid with a plain reason beside it, such as "Mailbox exists", "Mailbox not found", "Accepts all addresses", "Disposable address", "No mail server", "Server would not confirm" or "Provider hides mailbox status".
A quarterly alert-list routine
Export the alert list from the marketing platform, upload it, and download the valid file. Re-import it as a suppression-and-clean pair: suppress invalid addresses and keep valid ones as the active list.
Add intake leads weekly in a small CSV, and keep a record of the date each list was last verified.
Which plan fits, and what it costs
Starter is $9 a month for 2,500 checks; unused checks don't roll over. Pro is $39 a month with no per-email credits: never cut off: the first 100,000 emails a month run at full speed, then big lists run slower. Law firms usually start on Starter for a single list and move to Pro once lists arrive every month. The first 100 checks are free with a Google sign-in, no card, on the same engine the paid plans use.
A CSV holds up to 100,000 rows. If you work from an AI assistant, the same checks are available over MCP at https://simpleverifier.com/api/mcp, and Pro includes 10,000 calls a month included, then $1.50 per 1,000 for connecting a form or app.
How long it takes
Mailbox checks are paced, because mail servers slow down or block verifiers that probe too fast, and the daily check capacity is shared between customers. Addresses that need no mailbox check, such as broken syntax, dead domains and disposable addresses, come back at once. The rest run in a queue, and the job card shows an estimated finish time. Start the check before the send is due, and you can close the tab: the results wait in your history.
Common questions
- Can I upload client confidential data?
- You should not need to. Upload only email addresses. Decide with your own confidentiality rules before sharing anything else with any vendor.
- Does verification affect attorney-client mail?
- The check does not send a message to the recipient, so there is no email in the client's inbox from it.
- How do I try it first?
- The first 100 checks are free with a Google sign-in, no card, on the same engine the paid plans use.
- What does it cost?
- Starter is $9 a month for 2,500 checks, or Pro at $39 a month: never cut off: the first 100,000 emails a month run at full speed, then big lists run slower. Plans are monthly or yearly and cancel from your account.
Check an alert list
Pro is $39 a month and never cuts you off: the first 100,000 emails a month run at full speed, then big lists run slower. CSV uploads, the API (10,000 calls a month, then $1.50 per 1,000), the Google Sheets add-on and the email finder are included, and you can cancel any time. For smaller volumes, Starter is $9 a month for 2,500 emails a month.
The first 100 email checks are free with a Google sign-in, no card, on the same engine the paid plans use.