Блог Bulko

Blog about mailings
and deliverability growth

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

Paper plane icon Lightning icon Bulko mascot at desk
Cold Email Benchmark Report 2026: Open Rates, Reply Rates, and Trends
Cold Outreach

Cold Email Benchmark Report 2026: Open Rates, Reply Rates, and Trends

2026 cold email open rates average 28.7%, replies 4.1%. Hyper-personalization and multi-channel integration drive engagement.

Mar 16, 2026 8 min read
DNS Records for Email: The Complete Guide to MX, SPF, DKIM, and DMARC
Email Infrastructure

DNS Records for Email: The Complete Guide to MX, SPF, DKIM, and DMARC

Master email delivery. Configure MX, SPF, DKIM, and DMARC DNS records to ensure your messages reach inboxes, not spam folders.

Mar 16, 2026 12 min read
Email List Cleaning Best Practices: Reduce Bounces and Protect Your Domain
Email Management

Email List Cleaning Best Practices: Reduce Bounces and Protect Your Domain

Clean your email list regularly. Verify emails, remove bounces, and re-engage inactive subscribers to protect your domain.

Mar 16, 2026 7 min read
Cold Email A/B Testing Guide: Test Everything, Waste Nothing
Cold Outreach

Cold Email A/B Testing Guide: Test Everything, Waste Nothing

Optimize outreach with A/B testing. Compare email elements to boost open, reply, and conversion rates.

Mar 16, 2026 9 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 strategically. Export data, set up domains, and transition sending volume gradually to preserve deliverability.

Mar 16, 2026 8 min read
Best Email Subject Lines for Consulting and Professional Services
Cold Outreach

Best Email Subject Lines for Consulting and Professional Services

Boost your B2B outreach. Craft subject lines that get opened, build trust, and hint at solutions for your consulting services.

Mar 16, 2026 16 min read
Best Email Subject Lines for E-commerce Partnership Outreach
Cold Outreach

Best Email Subject Lines for E-commerce Partnership Outreach

Craft compelling subject lines to boost e-commerce partnership outreach. Unlock growth by ensuring your emails get opened, not trashed.

Mar 16, 2026 20 min read
Best Email Subject Lines for Recruiting and Talent Acquisition
Cold Outreach

Best Email Subject Lines for Recruiting and Talent Acquisition

Boost hiring success with compelling recruiting email subject lines. Grab attention and spark curiosity to increase open rates.

Mar 16, 2026 17 min read
Best Email Subject Lines for Real Estate Prospecting
Cold Outreach

Best Email Subject Lines for Real Estate Prospecting

Boost real estate email open rates. Craft compelling subject lines to stand out and improve prospecting success.

Mar 16, 2026 17 min read
Best Email Subject Lines for SaaS Sales Outreach
Cold Outreach

Best Email Subject Lines for SaaS Sales Outreach

Craft SaaS sales email subject lines that grab attention. Personalize for relevance and value to busy B2B decision-makers.

Mar 16, 2026 12 min read
Partnership Proposal Email: Templates for Business Development Outreach
Cold Outreach

Partnership Proposal Email: Templates for Business Development Outreach

Craft effective partnership emails. Use templates to spark conversations and open doors to growth.

Mar 16, 2026 20 min read
Meeting Request Email: Templates That Actually Get Booked
Cold Outreach

Meeting Request Email: Templates That Actually Get Booked

Boost your booking rates with proven meeting request email templates. Craft emails that get opened and convert prospects into scheduled appointments.

Mar 16, 2026 16 min read
1 2 3 4 5 9