Yes. BOL (Brasil Online) is part of the UOL group, and its mail server's rejection matched UOL's word for word in our checks.

Is there a free bulk UOL and BOL checker?

Yes. This page checks a whole list for syntax, duplicates, typo domains and dead domains for free, asks UOL and BOL's server about 10 mailboxes live, and gives 100 free email checks with a Google sign-in. No card.

Will the UOL and BOL users know I checked their address?

No. The check ends after the mail server answers about the mailbox, before any message content is sent, so nothing arrives in their inbox.

What happens to the addresses on my list that aren't UOL and BOL?

They are checked as normal addresses and marked as another provider. The live check asks about the UOL and BOL rows first.

Bulk UOL and BOL email checker: check a list of uol.com.br addresses at once

In short: Checks many uol.com.br and bol.com.br addresses at once: duplicates and +tag repeats flagged, and 10 mailboxes asked live at the UOL and BOL mail servers. Limit: UOL doesn't publish how its servers answer mailbox checks; the handling here is from our own checks, which can change.

A bulk UOL and BOL email checker tests many uol.com.br and bol.com.br addresses at once. Syntax, duplicates and dead domains are flagged in your browser, then the first 10 are asked live at the mail servers, which rejected made-up addresses with User unknown in relay recipient table in October 2026 and again on 8 November. A missing mailbox comes back invalid, a real one valid, an unclear answer risky.

Price: this tool is free. Checking a whole email list is from $9/mo, and the first 100 checks are free with Google, no card. Check your list free now See pricing

UOL and BOL addresses (uol.com.br, bol.com.br), one per line

Upload a CSV or TXT fileRuns in your browser. Only the domains are sent, to look up their mail servers; addresses stay on your device.

By SimpleVerifier Team · Last updated November 12, 2026

How do I check a whole list of UOL and BOL addresses?

Export the list as a CSV or copy the email column; UOL and BOL rows and every other domain can go in together.
Upload or paste it at /verify. Every address gets a live mailbox check, and the first 100 email checks are free with a Google sign-in, no card.

Check which of these mailboxes really exist

How do I check if many UOL or BOL addresses exist?

Paste the addresses, one per line, or a CSV column of them. Addresses at other providers are checked as normal addresses and marked.
Press Check the UOL and BOL addresses.
Read the flagged rows: a typo domain, a duplicate, a +tag repeat of an earlier row, or a domain with no mail server.
Download the clean list. Notes stay on it; only rows that fail a check come off.
The first 10 go to UOL and BOL's mail server for a live answer. Sign in with Google to check the rest with 100 free email checks.

Example

You enter: 6 addresses: jane.doe@uol.com.br, jane.doe+deals@uol.com.br, Jane.Doe@uol.com.br, a bol.com.br, a gmail.com and a company address.
You get: Jane.Doe@uol.com.br is marked as a duplicate of row 1 and comes off; jane.doe+deals@uol.com.br is marked as row 1 plus a +tag and kept; the gmail.com row is marked as another provider. The live check asks UOL and BOL about their rows first.
Limits: The browser pass covers the first 5,000 rows; only domains leave your device. 10 live checks a day without an account, then the free checks with a Google sign-in.

Can you check if UOL and BOL addresses exist in bulk?

Yes. When our checking server offered made-up addresses (uol.com.br on 12 October, bol.com.br on 13 October 2026), both answered at RCPT TO with 550 5.1.1 Recipient address rejected: User unknown in relay recipient table, word for word the same, and fresh made-up addresses at both were rejected again on 8 November. A result for a UOL or BOL row therefore comes from the provider's server.

The free page asks about 10 mailboxes live. A whole list goes through the bulk verifier, where these rows get the same check.

Why do BOL addresses need re-checking often?

BOL's help page says accounts are cancelled automatically after four months without use, so a @bol.com.br contact you haven't heard from in a season may no longer exist.

BOL is part of the UOL group, represented by Universo Online S.A. (UOL norms), and the two domains answered checks the same way, so this page treats them as one provider.

What does the bulk UOL and BOL check do to my list?

The pass over the whole list runs in your browser: syntax, duplicates, typo domains and role addresses. Only the unique domains are sent out, to look up mail servers and the disposable list. Rows at uol.com.br and bol.com.br are matched by the part after the @, so an address at any other domain is checked as a normal address and marked as another provider.

Then the first 10 addresses, UOL and BOL rows first, are asked live at the mail server without sending anything. Sign in with Google to check the rest with 100 free email checks. For one address with full notes, use the UOL and BOL checker.

What does each check catch on a UOL and BOL list?

Check	Can we confirm it?	Result when it fails
Syntax and duplicates	Yes, in your browser	Bad syntax comes off; a duplicate is marked
Domain and mail server (MX)	Yes, from DNS	No mail server comes off
Disposable or role address	Yes	Disposable comes off; a role address is marked
The mailbox exists	Yes: UOL and BOL answer at RCPT TO (550 5.1.1 User unknown)	Invalid, "Mailbox not found"; an unclear reply is risky
Someone reads the inbox	No checker can	Use opens, replies or a small first send

Mailbox behaviour as measured on uol.com.br and bol.com.br in October 2026 and on 8 November 2026.

Who uses this tool, and for what?

Brazilian shops and newsletters: Drop BOL mailboxes cancelled for inactivity before a campaign.
Lead buyers: Check the Brazilian webmail rows of a list before importing it.
List owners: Find repeated rows and +tag copies before counting your audience.

What can’t this tool tell you?

UOL doesn't publish how its servers answer mailbox checks; the handling here is from our own checks, which can change.
Only uol.com.br and bol.com.br count as rows here; other Brazilian webmail is checked as a normal address.
A +tag repeat is marked as possibly the same inbox, not merged, because this page doesn't verify how UOL treats tags.
The live check covers 10 addresses without an account; risky results there can mean the check was cut short, so try again later.
Valid means the mailbox exists today, not that anyone reads it.

Common questions

Is BOL part of UOL?: Yes. BOL (Brasil Online) is part of the UOL group, and its mail server's rejection matched UOL's word for word in our checks.
Does BOL cancel inactive accounts?: BOL's help says accounts are cancelled automatically after four months without use.
Is there a free bulk UOL and BOL checker?: Yes. This page checks a whole list for syntax, duplicates, typo domains and dead domains for free, asks UOL and BOL's server about 10 mailboxes live, and gives 100 free email checks with a Google sign-in. No card.
Will the UOL and BOL users know I checked their address?: No. The check ends after the mail server answers about the mailbox, before any message content is sent, so nothing arrives in their inbox.
What happens to the addresses on my list that aren't UOL and BOL?: They are checked as normal addresses and marked as another provider. The live check asks about the UOL and BOL rows first.

Sources

A tidy list can still be full of dead addresses.

Extracting, deduplicating and syntax checks all work on the text of an address. None of them can tell whether the mailbox exists. Only the server that hosts it can answer that, through an SMTP check, and that is what the paid product does.

Upload the cleaned file as it is: CSVs up to 100,000 rows
A real SMTP mailbox check on every row, with catch-all detection
Small list? Starter at $9/mo covers 2,500 emails a month, cancel anytime

Get started — $39/mo See the published limits first

Plans from $9 a month, cancel anytime, no contract. Sign in with Google and your first 100 email checks are free, no card. The free tools stay free either way.