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Verify your Sendloop audience before you send

Sendloop tracks subscribers in list browse views with one-click CSV export, but invalid addresses still ride along until a send fails or a manual cleanup happens. Exporting a list, verifying it with Bounceless, and re-importing send-decision rows catches typos and dead mailboxes while they are still spreadsheet rows, not SMTP failures on your delivery IP.

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How it works

[01]Export your Sendloop subscriber listOpen the list browse screen for the Sendloop list you want to check. Use the built-in export tool — Sendloop documents a single-click CSV export from this screen that you can open in Excel, Google Sheets, or any CSV-compatible editor.
[02]Verify the export in BouncelessUpload the CSV to Bounceless and start a bulk verification job. Every address receives a confidence level, reason codes, and a Pre-Send Decision: send, review, or suppress.
[03]Download the verified resultsWhen the job finishes, download the results and separate send-decision addresses from suppress-decision ones before you upload anything back to Sendloop.
[04]Re-import the clean listReturn to Sendloop and import the verified CSV through the standard subscriber import flow documented in the Sendloop Help Portal. Map the email column correctly and exclude suppress-decision rows so invalid addresses do not rejoin the list.

Steps are sourced from Sendloop's official documentation (reference) and have not yet been walked on a live Sendloop account by a Bounceless team member — treat exact menu labels as indicative until this note is removed.

When to run it

Pre-send list cleaningExport the list attached to your next campaign, verify it in Bounceless, and re-import only deliverable rows so your Sendloop delivery IP does not absorb preventable hard bounces.
Double opt-in list maintenanceSendloop Help Portal covers single versus double opt-in lists. Verification before import helps ensure pending or imported batches do not contain addresses that will never confirm or deliver.
Agency client onboardingSendloop serves high-volume senders and agencies. Verify a client CSV in Bounceless before the first Sendloop import so the account starts with checked addresses instead of inherited list decay.

Common questions

Does Sendloop offer native email verification?

Sendloop focuses on delivery infrastructure and list management; its public help portal emphasizes export, import, and deliverability practices rather than built-in third-party verification. Bounceless adds a Pre-Send Decision layer before addresses enter Sendloop sends, without replacing Sendloop own bounce handling after mail goes out.

Do I need Sendloop API credentials for this workflow?

No. This guide follows the CSV export button on Sendloop list browse screen and the dashboard import flows described in Sendloop Help Portal. Bounceless never receives Sendloop API keys; you move a file between the two products manually, which keeps permissions simple for marketing teams without developer access.

What file format does Sendloop export use?

Sendloop documents CSV export from the list browse screen, compatible with Excel, Numbers, and other spreadsheet tools. Upload that same CSV structure to Bounceless, then trim or filter the verified output before re-import so column headers still match what Sendloop expects on upload.

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