Verify every prospect before it enters an Outreach sequence
Outreach detects a hard bounce and can automatically finish a prospect out of its sequence, but it can only react after a message has already gone out — and on cold outreach that first send to an unverified prospect is exactly what burns your sending mailbox. Qualisend closes that gap: export your prospects, verify every address, and keep the invalids out of the cadence before a single step fires. Here's the workflow that works today, plus the REST API for verifying at the point of capture.
The Outreach connector is coming soon
A native one-click Outreach connector — connect, clean your list in place, and verify new contacts automatically — is being built right now. It's on the way, not deprecated. In the meantime, everything you need to keep Outreach clean already works.
The CSV export → verify → reimport loop below, and the API for verifying at signup, are both fully supported and running in production — that's how teams keep Outreach clean today.
What Outreach cleans for you
Outreach's native hygiene runs on bounce detection and its opt-out model. When a message hard-bounces, Outreach flags the prospect's email as bounced and, with an admin bounce ruleset in place, automatically finishes that prospect out of any active sequence so no further steps send. It also honors opt-outs and the Do Not Contact flag, permanently excluding those prospects from every future cadence. For addresses Outreach has actually mailed, that's reliable automatic protection.
What it can't catch
The catch is that every one of those mechanisms is reactive — it needs a send and a bounce to fire before it does anything. Never-mailed invalids from a purchased or scraped prospecting list, disposable addresses, role addresses like info@ and sales@, decayed mailboxes, and catch-all domains all look perfectly sequenceable until step one hits them and bounces. An imported prospect list is the sharpest case: it lands in Outreach with its bounce history stripped, so addresses that were already dead on another tool look brand new, and Outreach has no signal to skip them until it has already mailed them once.
Why a clean Outreach list matters
Cold email lives or dies on bounce rate and domain reputation, and on Outreach the damage compounds fast because you're sending from real, warmed mailboxes at scale. One unverified list can spike your bounce rate, and mailbox providers read that as a low-trust sender — a single bad cadence can burn the sending domain and the mailbox behind it, which no amount of clever copy recovers. Gmail and Yahoo's 2024 bulk-sender rules put hard numbers on it, asking senders to keep bounces and spam complaints low or lose inbox placement entirely. Verifying before a prospect ever enters a sequence isn't hygiene on cold outreach, it's survival.
The workflow that works today
On cold outreach the goal is to verify a prospect before it ever enters a sequence, so the invalids never cost you a send, a bounce, or your domain reputation.
Export your prospects from Outreach
Open the Prospects tab, filter to the list or segment you're about to sequence (or the cadence you want to audit), select the prospects, and use the bulk Export option to download them as a CSV. Export may need to be enabled for your profile by an admin.
Verify the file in Qualisend
Upload the CSV to Qualisend bulk cleaning — up to 1,000,000 addresses per job, duplicates charged once, with live progress — or paste addresses directly. The free plan's 100 one-time credits that never expire cover a first sample.
Read the results
Every address returns deliverable, risky, undeliverable, or unknown with a machine-readable reason code and sub-flags (catch-all, disposable, role, full mailbox), plus the MX provider and SMTP probe detail as evidence and a 0–100 confidence score. Download the cleaned CSV.
Keep the invalids out of your cadence
Filter the results to undeliverable, match those prospects in Outreach, then bulk Finish them out of any active sequence and mark them Do Not Contact (or delete them) so they're skipped on every future cadence. The highest-leverage move is to verify before adding a prospect at all, so a dead address never reaches step one.
Or automate it at signup
Prefer to keep junk out from the start? Verify at the point of capture with the Qualisend REST API (scoped keys, rate limits, webhooks), or wire a no-code flow through Zapier, Make, or n8n so a prospect is checked before it's ever created in Outreach — the safest place to catch a bad address is before it can be added to a sequence.
What Qualisend flags on every address
- Never-mailed invalid addresses that would bounce on the very first sequence step and burn your sending mailbox
- Disposable / throwaway domains built to expire before your cadence finishes
- Role addresses (info@, sales@, support@) that rarely reach a decision-maker and skew your reply rate
- Catch-all domains, flagged so you can move them to a slower, throttled sequence instead of a full-speed cadence
- A 0–100 confidence score and machine-readable reason code for every prospect, so borderline addresses are a decision, not a guess
A native one-click Outreach connector is on the way — it's being built now, not deprecated. Until it ships, the CSV loop above and the API are the fully supported path, and they work with any Outreach plan.
What to do with each result
Every address comes back with a verdict and sub-flags. Here's the action that keeps your Outreach list clean without throwing away contacts you can still reach.
deliverableAdd to the sequence and send as planned.deliverable + role flagSequenceable, but expect a shared inbox — route to a lower-priority cadence or find a named contact first.risky + catch-all flagMove to a dedicated, throttled sequence; don't blast a catch-all domain at full cadence speed.risky + disposable flagSkip — mark Do Not Contact; the inbox was built to expire.unknownHold out of the sequence and re-verify next clean — usually greylisting, not a verdict on the mailbox.undeliverableKeep out of every cadence — Finish and mark Do Not Contact, or delete; don't wait for the bounce to prove it.Related reading
Why verifying prospects before they enter a sequence is non-negotiable for cold outreach.
How bounce rate and reputation decide whether your Outreach cadences land in the inbox.
Protect the warmed mailboxes behind Outreach — one dirty list can undo weeks of ramp.
The 2024 bounce and spam-rate thresholds your cold cadences have to clear.
Verify at the point of capture so a bad address never becomes an Outreach prospect.
Outreach verification FAQ
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