Email Infrastructure
Email API vs SMTP: Differences, Tradeoffs, and When to Use Each
Compare email API and SMTP by integration model, portability, campaign controls, security, errors, retries, and ideal use case.
How to Send Email with the Bulko API: Python and cURL Guide
Use the Bulko REST API to import recipients, launch managed email campaigns, poll statistics, retrieve replies, and handle errors safely.
SMTP Proxy: Boost Deliverability & Scale Cold Outreach
SMTP proxy boosts email deliverability and scales cold outreach. It manages IP reputation, load balancing, and connection handling.
SMTP Relay vs Direct Sending: Differences and Use Cases
SMTP relay outsources queues and delivery; direct-to-MX sending gives full control and full operational responsibility. Compare architecture, cost, and use cases.
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.
Email Authentication Explained Simply: SPF, DKIM, DMARC, and BIMI
Verify email senders and message integrity with SPF, DKIM, DMARC, and BIMI. Improve deliverability and protect against spoofing.
How to Set Up Multiple Domains for Cold Email Without Getting Banned
Protect your brand and boost deliverability. Acquire secondary domains, configure DNS, and warm them for high-volume cold email.
Best SMTP Services for Email Outreach in 2026: 6 Options
Compare six SMTP services for outreach, applications, and marketing: Bulko, Mailgun, Amazon SES, SMTP2GO, Brevo, and SendGrid, with current pricing.
Cold Email Infrastructure Setup: Complete Guide for 2026
Master cold email infrastructure for 2026. Set up domains, DNS, SMTP, and warm-up for peak deliverability.
Boost Cold Outreach: Send Emails from Google Workspace
Master Google Workspace for cold outreach. Configure SMTP, understand limits, and set up authentication for high deliverability.
Best Free SMTP Servers in 2026: Limits Compared
Compare current free SMTP limits for Brevo, Mailgun, Gmail, SendGrid, Amazon SES, and Bulko, including trials, credits, and policy restrictions.
How to Set Up SMTP Rotation for Bulk Email
Learn how to implement SMTP rotation to improve deliverability for your bulk email campaigns. This guide provides a step-by-step setup, ensuring your cold outreach efforts on Bulko remain effective and compliant. Optimize your email sending strategy for better inbox placement.