Why we verify your email list for free (and why almost nobody else does)
Here's a quiet conflict of interest at the heart of the email industry: most platforms charge you by list size or send volume, which means a dirty list — dead addresses and all — makes them more money, right up until it gets you into deliverability trouble.
Verification, meanwhile, is sold separately: export your list, pay a third-party service per address, re-import. Most people skip it. Then they wonder why their open rates sag and their mail drifts toward spam.
We think that's backwards, so we built it the other way: every PristineSend plan includes a free monthly verification allowance — from 250 checks on Starter up to 8,000 on Pro, with pay-as-you-go beyond that. Clean lists aren't an upsell; they're the foundation the whole product stands on.
What verification actually checks
"Verification" sounds like a black box. It isn't. A proper check runs an address through a pipeline:
Syntax. Is it even a validly formed address? Catches typos and keyboard-mash signups.
Domain and MX records. Does the domain exist, and does it have mail servers? @gmial.com fails here.
Mailbox check. The verifier opens a conversation with the receiving mail server and asks whether the specific mailbox exists — without sending an email. This is the step that catches deleted accounts and departed employees.
Catch-all detection. Some domains accept mail for any address, so the mailbox check can't say yes or no definitively. These come back as "risky" — deliverable in form, unverifiable in fact.
Disposable and role detection. Ten-minute throwaway domains, and role addresses like info@ or admin@ that no individual reads and that complain at above-average rates.
The output isn't just valid/invalid — it's valid, invalid, or risky, and what you do with "risky" should depend on how conservative your warm-up situation demands you be.
When to verify
- Every import, no exceptions. This is where bounce disasters come from. A list that sat for six months has decayed more than you think — B2B addresses die at 20–30% a year.
- Before mailing a cold segment. Haven't touched those subscribers in six months? Verify before you wake them.
- On signup, ideally. Catching
gmial.comat the form is worth ten cleanups later.
The economics, honestly
Verification costs real money to run — it's the dominant cost in our stack, far more than sending itself (a send is a rounding error by comparison). That's exactly why competitors bill it separately: it's a clean margin line.
We include it anyway because of what it does to outcomes. A customer who verifies routinely bounces less, complains less, lands in the inbox more, and stays longer. Deliverability is our entire pitch — subsidizing the single behavior that most protects it isn't charity, it's alignment.
The bottom line
List hygiene is the least glamorous, highest-leverage work in email — which is why it shouldn't have a paywall in front of it. If your current platform treats verification as someone else's product, ask yourself who's paying for that arrangement. (It's you, in bounces.)