Postigo Blog

Blog about mailings
and deliverability growth

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

Improve Cold Email Reply Rates with A/B Testing Strategies
Cold Outreach

Improve Cold Email Reply Rates with A/B Testing Strategies

Boost cold email replies. A/B test subject lines, copy, and CTAs to find what resonates and drives engagement.

Mar 21, 2026 10 min read
Building an ICP for Cold Email: A Step-by-Step Guide
Lead Generation

Building an ICP for Cold Email: A Step-by-Step Guide

Craft an ICP for cold email by analyzing best customers, firmographics, psychographics, and pain points. This boosts engagement and conversions.

Mar 20, 2026 10 min read
SMTP Port Numbers: A Comprehensive Guide for Email Deliverability
Email Deliverability

SMTP Port Numbers: A Comprehensive Guide for Email Deliverability

SMTP ports are channels for email transmission, like 25, 465, and 587. Choosing the right port impacts deliverability and security.

Mar 17, 2026 9 min read
Email Warm-up for Agencies: Maximize Deliverability & Client ROI
Email Deliverability

Email Warm-up for Agencies: Maximize Deliverability & Client ROI

Boost client email deliverability and ROI. Warm-up ensures your agency's emails land in inboxes, not spam.

Mar 16, 2026 10 min read
Cold Email vs LinkedIn Outreach: Which Channel Wins for B2B in 2026?
Lead Generation

Cold Email vs LinkedIn Outreach: Which Channel Wins for B2B in 2026?

Cold email and LinkedIn outreach are key B2B channels. Learn which wins for 2026 strategy.

Mar 16, 2026 13 min read
Google and Yahoo Sender Requirements 2026: What Cold Emailers Must Know
Compliance

Google and Yahoo Sender Requirements 2026: What Cold Emailers Must Know

Google and Yahoo's 2026 sender rules demand strong email authentication and low spam rates. Cold emailers must adapt now for future deliverability.

Mar 16, 2026 8 min read
SMTP Relay vs Direct Sending: Which Is Better for Cold Email?
Email Infrastructure

SMTP Relay vs Direct Sending: Which Is Better for Cold Email?

SMTP relay services offer optimized deliverability and ease of use. Direct sending provides granular control for technical teams.

Mar 16, 2026 11 min read
How to Build a B2B Email List from Scratch: Ethical Methods That Work
Lead Generation

How to Build a B2B Email List from Scratch: Ethical Methods That Work

Build a B2B email list ethically. Use public data, enrichment tools, and content marketing, not purchased lists.

Mar 16, 2026 9 min read
Cold Email for Startups: Get Your First 100 Customers Without a Budget
Cold Outreach

Cold Email for Startups: Get Your First 100 Customers Without a Budget

Acquire your first 100 customers with cold email. This guide details how to master outreach without a budget.

Mar 16, 2026 9 min read
Cold Email Automation: How to Build Sequences That Convert
Cold Outreach

Cold Email Automation: How to Build Sequences That Convert

Build converting cold email sequences. Combine personalization, multi-touch follow-ups, and smart logic for better outreach.

Mar 16, 2026 8 min read
Email Deliverability Audit: How to Run a Complete Check in 60 Minutes
Email Deliverability

Email Deliverability Audit: How to Run a Complete Check in 60 Minutes

Boost inbox reach. Audit your email deliverability in 60 minutes for better sender reputation and engagement.

Mar 16, 2026 9 min read
Email Blacklist Removal Guide: Step-by-Step for Every Major Blacklist
Email Deliverability

Email Blacklist Removal Guide: Step-by-Step for Every Major Blacklist

Remove your IP or domain from email blacklists. Identify the blacklist, fix the issue, then follow delisting steps for each.

Mar 16, 2026 10 min read
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