infrastructure
CallSine can handle your inbox creation, routing, warmup, and monitoring so your outbound always gets delivered and never gets flagged.
Unseen messages don’t convert.
Most teams ignore email infrastructure until things break. Without proper setup and protection, even the best outreach ends up in spam or gets throttled.
Rotates inboxes and domains
Rotates inboxes and manages routing across multiple domains
Monitors performance
Monitors deliverability and alerts you if performance drops
Scales volume safely
Scales sending volume without hurting sender reputation
Purpose-built for outbound
This isn’t retrofitted newsletter tech. It’s designed for high-volume outbound with sequencing, agent-led messaging, and reply handling in mind.
Automates what ops teams usually manage manually
From inbox creation to warmup to error routing, Callsine removes the need for cobbled-together systems.
Central visibility and performance control
Monitor sending behavior and inbox performance from one place, without needing external deliverability vendors.
Scales without risk
Send more messages without sacrificing domain health or SDR output. Everything stays optimized behind the scenes.
Callsine’s infrastructure layer keeps your outbound safe, deliverable, and ready to scale.
