Email Infrastructure
SMTP Server for Bulk Email in 2026: Where to Get One, Cost, and Avoiding Spam
Regular mailboxes cap SMTP sending at a few hundred emails a day. Here is which SMTP server to use for bulk email, what it costs, and what to set up so your mail reaches the inbox.
Port 465 or 587: What Is the Difference and Which to Use for SMTP
Both ports encrypt mail submission; they differ only in when TLS starts. Here is how 465 (SSL) and 587 (STARTTLS) compare, when 2525 helps, and why port 25 is usually blocked.
Amazon SES from Russia in 2026: Access, Restrictions and Alternatives
AWS stopped accepting new sign-ups from Russia in March 2022 and Russian cards are declined. Here is what that means for Amazon SES and which sending services work instead.
Transactional Email API: SMTP vs HTTP, and How to Send in 2026
A transactional email API sends triggered one-to-one mail (resets, receipts) from your app. SMTP vs HTTP, providers compared, and how to send with Bulko from $5 for 5,000 emails.
Bulk Email Sender: How to Send Mass Email Safely in 2026
A bulk email sender delivers one message to many recipients. Two methods (campaign platform vs SMTP relay), how to avoid spam, and how to pick a tool. Bulko from $5 for 5,000 emails.
Best SMTP Services in 2026 (by Use Case)
The best SMTP service depends on use case: Bulko for no-commitment pay-as-you-go, Amazon SES for the lowest price at scale, Brevo/SMTP2GO for free tiers, SendGrid/Postmark for managed deliverability.
Cheapest SMTP Relay Services in 2026: Pay-As-You-Go vs Subscription
The cheapest SMTP relay depends on how you send. Pay-as-you-go (Bulko, $5 for 5,000 emails, no subscription) wins for low and irregular volume; Amazon SES is cheapest per email at scale.
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.