Deliverability

Your reputation belongs to you

Cold email platforms send on your behalf, from IP addresses shared with thousands of strangers. Sestaro does the opposite: your messages leave from your own server.

Yours

The sending

  • Your sending server and your credentials. We never relay a message.
  • Your domain and your address: that is what your recipients see.
  • The reputation you build. If you ever leave, you take it with you.
Ours

The rest, and nothing more

  • The domains that carry open and click tracking.
  • The return address where refusals come back, so they can be classified.
  • The database, the campaigns, the reports. Everything except the sending.
What we control on your behalf

Without ever taking over what belongs to you.

Your DNS zone stays yours

The setup screen gives you the exact list of records to publish, then queries your own nameservers to confirm that SPF, DKIM and DMARC answer. You edit your zone, we verify.

We never manufacture a key on your behalf. A signing key your vendor holds is a key you do not control.

We stop you before you burn your domain

A fresh domain that sends a thousand messages on day one gets filed as junk and does not come back. Volume ramps up gradually, and it freezes on its own if the returns get worse.

Here is when we act. Nobody publishes these thresholds; knowing them in advance beats discovering them on a Monday morning. They are computed over a rolling seven-day window. A stop needs at least 50 sends in that window and refusals from at least three different recipients, and it lifts on its own once the window is clean again.

1.5%bounces while your volume ramps up: the volume stops growing. At 2%, it falls back to the starting level.
5%addresses that do not exist: sending stops. You get a warning from 3%.
2%policy refusals (reputation or content): sending stops. You get a warning from 1%.

The message is scored before it leaves

Every message goes through a spam analysis and you see the result before sending. A test goes to yourself, through your own server, and writes nothing: no statistic, no enrolment, no counter.

Refusals are classified, not piled up

An address that does not exist and a server refusing on policy grounds are not the same problem. Returns come back to an address we own and are sorted by refusal code. Dead addresses enter the suppression list and never receive anything again.

The unsubscribe link is in every message and works in one click, immediately and permanently. We do not keep the address in the clear: an encrypted fingerprint is enough to guarantee it never goes back into a campaign.

Several brands, several domains

An account declares as many sending domains as it has brands. Each one has its own authentication and its own ramp-up, and you pick which one carries each campaign.

Read next
Prospecting The targeting criteria, the free preview before you spend, and the alerts that reach you in the morning. See → Verification What happens when an address is bad: your sestaro comes back, and the address leaves the database. See → Pricing Packs or subscription, no commitment. You only pay for the contacts you unlock. See →

Try it on your own domain

The account is free and needs no card. You will see the setup screen before deciding anything.

Create a free account