Email Deliverability Service for Cold Outreach

Deliverability isn’t a setting. It’s the difference between a campaign that books meetings and a domain your invoices stop arriving from. Otto manages sending reputation as a standing engineering job.

100% deliverability, 52% average open rate.

Why cold domains burn

Sending from your primary domain.
One bad campaign and your billing email starts landing in spam.
Cold start at volume.
New addresses sending 200/day on day one is the clearest spam signal there is.
Stale lists.
Contacts decay roughly 2.5% a month. Bounces above 2–3% and providers start throttling you.
Uniform patterns.
Identical text at identical intervals from identical volumes reads as automation, because it is.
Broken authentication.
SPF, DKIM and DMARC misconfigured — the most common failure we find, and the easiest to fix.

What We Run

Dedicated sending subdomain. Outreach isolated from your primary domain. If reputation ever takes a hit, your business email is untouched.

Private IPs. Your sending reputation is yours, not inherited from whoever else is on a shared pool.

Structured warmup. Volume ramped over weeks, per inbox provider, until the domain has real history.

Real-time validation. Every address verified immediately before send, not when the list was bought.

Adaptive sending. Volume and timing adjust to engagement and provider behavior, per mailbox. Continuous data hygiene. Our tech team maintains contact data on an ongoing basis. Bounce rates stay low because the list stays true. Authentication done right. SPF, DKIM, DMARC configured and monitored.

 

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Already Burned?

If your domain is throttled or your open rates have collapsed, we start with diagnosis: authentication audit, reputation check, bounce and complaint analysis, list quality assessment. Then we rebuild sending on isolated infrastructure while the old reputation recovers. Tell us the symptoms on the call and we’ll tell you honestly whether it’s fixable and how long it takes.

How We Measure It

Deliverability is tracked per campaign and per provider, visible on your dashboard: inbox placement, bounce rate, complaint rate, open rate. Numbers, live, not a quarterly assurance.