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Beyond open rates: the outreach KPIs that actually predict revenue
The three tier KPI framework for B2B outreach, with 2026 benchmarks and the equation that turns them into a pipeline forecast.
24 min read
- Deliverability
- Cold Email
The Tantra blog
Playbooks for cold email and calendar outreach, from the team building Tantra.
Cold Google Calendar outreach in 2026: hard limits, warmup, and ban triggers
Every hard limit for cold calendar outreach in 2026, the warmup protocol, the ban triggers, and the psychology behind a 65% accept rate.
39 min read- Calendar Outreach
- Deliverability
- Cold Email
Cold Google Calendar outreach in 2026: hard limits, warmup, and ban triggers
Every hard limit for cold calendar outreach in 2026, the warmup protocol, the ban triggers, and the psychology behind a 65% accept rate.
39 min read- Calendar Outreach
- Deliverability
- Cold Email
Google Workspace deliverability: the setup manual and the error codes that tell you what broke
How to configure SPF, DKIM and DMARC on Google Workspace, warm a mailbox properly, and read the SMTP error codes that tell you what actually broke.
18 min read- Deliverability
- Cold Email
From registration to revenue: a playbook for B2B webinar attendance
Why only half your registrants show up, what actually moves that number, and how to run the reminder, live and follow up phases.
14 min read- Webinars
- Calendar Outreach
- Cold Email
How to land in the Gmail Primary inbox during cold outreach
Gmail makes two decisions about your email. The stop words that matter, sorted into three buckets, and the compliance trade off nobody mentions.
42 min read- Deliverability
- Cold Email
Email open tracking is broken. Here is what to measure instead
Pixels now fire for privacy proxies and security scanners, not readers. Why the metric broke, what it still costs, and the three signals to read instead.
15 min read- Deliverability
- Cold Email
Try Tantra on your own mailboxes
Cold email sequences and calendar invite campaigns that send through your Google Workspace, with AI personalization on your own API key.
Cold email marketing in 2026 with AI: how spam filters actually work
How spam filters evaluate email in 2026, why AI written copy gets flagged, and the psychology that separates a 2% reply rate from 15%.
32 min read- Deliverability
- Cold Email
Run outreach from your own mailboxes
Cold email sequences and calendar invite campaigns that send through your Google Workspace, with AI personalization on your own API key.
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