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from $3.50 / 1,000 results

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Email Verifier: Bulk, SMTP & Catch-All Checks

Try for free

Most verifiers report "valid" after a DNS check. That's how clean lists still bounce. We ask the mail server whether the mailbox exists, flag catch-all, disposable and role addresses, and give you one verdict per address with the reason. Honest "unknown" beats a confident guess.

Pricing

from $3.50 / 1,000 results

Rating

0.0

(0)

Developer

toolmill

Actor stats

Bookmarked

Total users

Monthly active users

12 days ago

Last modified

Categories

Lead generation

Developer tools

Emails

emails

Required

Email addresses to verify, one per line. Duplicates are verified once.

Type:array

Live SMTP mailbox check

smtpCheck

Optional

Connect to the recipient's mail server and ask whether the mailbox exists. Slower, but the only way to get a 'deliverable' verdict. Off = syntax, MX, disposable and role checks only.

Type:boolean

Default:true

Detect catch-all domains

catchAllCheck

Optional

Also probe a random address on each domain. Domains that accept anything are reported as 'risky / catch_all' instead of 'deliverable'.

Type:boolean

Default:true

Per-check timeout (ms)

timeoutMs

Optional

Timeout for each DNS or SMTP step.

Type:integer

Minimum:1000

Maximum:60000

Default:8000

Concurrency

concurrency

Optional

How many emails to verify in parallel. Per-domain concurrency is capped at 2 regardless, to stay polite to mail servers.

Type:integer

Minimum:1

Maximum:50

Default:10

MAIL FROM address

fromEmail

Optional

Sender address used in the SMTP probe. Never sends mail.

Type:string

Default:verify@toolmill.co

Reuse recent results

useCache

Optional

Remember definitive results (mailbox exists / does not exist, catch-all domains) across runs so repeat addresses are instant and not re-charged. Addresses are stored hashed.

Type:boolean

Default:true

Reuse results newer than (days)

cacheTtlDays

Optional

How old a remembered result may be before it is re-checked.

Type:integer

Minimum:1

Maximum:180

Default:30

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