Блог Bulko

Blog about mailings
and deliverability growth

Practical tips, case studies, and guides on email marketing, deliverability, and campaign automation.

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Beyond Open Rates: Mastering Cold Email Reply Rate Optimization
Cold Outreach

Beyond Open Rates: Mastering Cold Email Reply Rate Optimization

Boost cold email replies. Craft ultra-relevant value, clear CTAs, and strategic follow-ups to spark conversations and drive conversions.

Sep 18, 2026 11 min read
Optimizing Your Cold Outreach: How to Choose the Best Email Warm-Up Tool
Email Deliverability

Optimizing Your Cold Outreach: How to Choose the Best Email Warm-Up Tool

Boost cold outreach deliverability. Compare top email warm-up tools like Warmup Inbox, Instantly.ai, and Mailreach to build sender reputation.

Sep 8, 2026 9 min read
Optimizing Your Cold Email Outreach with Custom Tracking Domains
Email Deliverability

Optimizing Your Cold Email Outreach with Custom Tracking Domains

Boost cold email deliverability and open rates. Custom tracking domains brand links and avoid spam filters.

Sep 5, 2026 14 min read
Mastering IP Warm-Up for High Email Deliverability
Email Deliverability

Mastering IP Warm-Up for High Email Deliverability

Gradually increase email volume from a new IP to build a positive sending reputation. This ensures high deliverability and inbox placement, avoiding spam folders.

Sep 3, 2026 8 min read
Optimizing Cold Email Sending Limits for Maximum Deliverability
Email Deliverability

Optimizing Cold Email Sending Limits for Maximum Deliverability

Master cold email sending limits. Boost deliverability by understanding caps, scaling volume, and managing sender reputation.

Aug 30, 2026 9 min read
Optimizing Cold Email Open Rates: The Ultimate Guide to Preheaders
Cold Outreach

Optimizing Cold Email Open Rates: The Ultimate Guide to Preheaders

Boost open rates 10-20% with optimized cold email preheaders. This secondary subject line entices recipients and previews your message's value.

Aug 29, 2026 10 min read
Beyond Open Rates: How to Track Cold Email Metrics That Matter
Cold Outreach

Beyond Open Rates: How to Track Cold Email Metrics That Matter

Track cold email success beyond open rates. Focus on delivery, reply, positive reply, CTR, and conversion for actionable insights.

Aug 21, 2026 9 min read
Optimizing Your Cold Email Outreach with A/B Testing
Cold Outreach

Optimizing Your Cold Email Outreach with A/B Testing

Boost cold email success. A/B test elements like subject lines and calls to action to optimize campaigns for higher engagement and conversions.

Aug 19, 2026 11 min read
How to Migrate from Instantly to Postigo Without Losing Deliverability
Email Management

How to Migrate from Instantly to Postigo Without Losing Deliverability

Migrate from Instantly to Postigo seamlessly. Maintain deliverability with a phased approach, careful setup, and continuous monitoring.

Aug 16, 2026 7 min read
Apollo vs Postigo: Full Comparison for B2B Sales Outreach
Comparisons

Apollo vs Postigo: Full Comparison for B2B Sales Outreach

Apollo excels in integrated sales intelligence. Postigo focuses on efficient outreach.

Aug 14, 2026 12 min read
Smartlead vs Postigo: Which Scales Cold Email Better?
Comparisons

Smartlead vs Postigo: Which Scales Cold Email Better?

Smartlead vs Postigo: a deep dive into scaling cold email. Compare features to maximize deliverability and conversions.

Aug 9, 2026 9 min read
Woodpecker vs Postigo: Cold Email Tool Comparison for 2026
Comparisons

Woodpecker vs Postigo: Cold Email Tool Comparison for 2026

Woodpecker and Bulko are top cold email tools for 2026. Woodpecker suits established teams needing CRM integration; Bulko offers cost-effective flexibility.

Aug 8, 2026 12 min read
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