Email verification for email marketing agencies

The use case

A client moves from one ESP to another, merges lists after an acquisition, or hands over an export from years ago. You do not know which addresses still work. Verifying before the import means the first send on the new account goes to addresses that can receive mail, and the invalid ones are suppressed instead of imported.

The workflow

1. 1

   Export from the old platform

   Export the list as a CSV. The export guides cover Klaviyo, Mailchimp, Brevo, Kit, beehiiv and many other platforms.

2. 2

   Verify under the client's workspace

   Upload the export on Agency and file it under the client. Each row gets valid, risky or invalid with a reason.

3. 3

   Import valid, hold risky

   Import the valid file. Keep risky addresses (catch-alls, role inboxes) out of the first sends, or add them to a separate segment.

4. 4

   Or verify in place

   The Mailchimp and HubSpot integrations verify an audience, list or segment in the account and write the result to a field. Removing invalid contacts there is opt-in.

5. 5

   Re-verify before big sends

   Addresses go bad over time. Re-check before a seasonal or launch send.

Which plan fits

Agency ($249) when you run email for several clients and want their lists apart: 750,000 emails a month at full speed, 15 seats and client workspaces. Business ($99) covers 300,000 emails a month with 5 seats if you have fewer clients.

Full speed is a monthly volume, not a promise of hours. Mailbox checks are paced and the day's check capacity is shared between customers, so a very large list takes days. It queues rather than failing, and the job card shows an estimated finish time. Plan client deadlines around that.

A deliverable list is not a consented list. Verification cannot fix subscribers who never opted in, and it does not find inactive subscribers; use the ESP's engagement data for that.

Common questions

Does verification stop an ESP from flagging the account?

It removes addresses that cannot receive mail, which lowers bounces. Complaints, consent and content are separate, and each ESP applies its own rules.

Can we verify inside Mailchimp or HubSpot without exporting?

Yes. Connect the account, pick an audience, list or segment, and the result is written back to a field on each contact. Archiving or unsubscribing invalid contacts is opt-in.

How do seats and client workspaces work?

A seat is one person, the owner included: Business has 5 seats and Agency has 15. Teammates share the account's lists, monthly volume and API keys. Client workspaces are on Agency: you pick a client when you upload a list, then filter History and exports by client. Deleting a workspace keeps its lists; they just lose the label.

What does the priority lane do, and how fast is it?

Big lists on Business and Agency go ahead of other big lists in the shared queue, within the plan's monthly full-speed volume. Small lists under 2,000 rows always run first on every plan. Full speed is a monthly volume, not a promise of hours. Mailbox checks are paced and the day's check capacity is shared between customers, so a very large list takes days. It queues rather than failing, and the job card shows an estimated finish time. Plan client deadlines around that.

Related

• Verify a Klaviyo export
• Mailchimp integration
• HubSpot integration
• Partner and referral program

Other kinds of agency

• Cold email agencies
• Lead generation agencies
• SDR and outsourced sales teams
• Recruiters and staffing agencies
• Marketing agencies managing client lists
• Deliverability consultants
• Data and list brokers
• Clay and GTM engineering agencies
• Appointment setting agencies
• Staffing agencies doing business development
• B2B data providers and enrichment vendors