Best SaaS Black Friday Deals of 2026
Black Friday is here once again. There’s truly no better time to snag the best SaaS tools that…
Email Deliverability
To master this topic and boost your inbox placement start with our ultimate deliverability guides
HELO/EHLO and Sender Reputation: The SMTP Handshake Explained
Before a single word of your email is read, your server has already introduced itself. The SMTP HELO…
SMTP Ports Explained: 25, 465, 587, and Which One to Use
Short answer: to send from an app, CRM, or email client, use SMTP port 587 with STARTTLS, or…
Email Footer Best Practices: What to Include and What Hurts Deliverability
It is easy to ignore until something goes wrong. But once you need to know which company sent…
Domain Checker: What a Full Domain Health Check Should Include
Look at the pages that rank for domain check, and you will see that they answer a narrow…
Free IP & Domain Blacklist Checker: Check Blacklist Status, Reputation & Reverse DNS
IP block list checker for IP addresses and domains against blacklists – search for an address in spam…
Free SPF, DKIM & DMARC Checker: Test & Fix Your Email Authentication in Seconds
SPF, DKIM, and DMARC are mechanisms for email authentication that help legitimate senders establish their identity and receivers…
Email Header Analyzer: How to Read Your Own Headers for Deliverability
An email header analyzer is usually treated as a security tool for investigating suspicious messages. At the same…
Why Can’t I Send Email? A Fast Diagnostic Guide to SMTP Errors
Did the email remain in your Outbox? Or did the mail server return an error after you clicked…
MX and DNS Record Lookup for Email: How to Check Your Setup Before It Breaks
An MX lookup shows where a domain receives email and whether the routing information published in DNS is…
Email Verifier: How to Check If an Email Address Is Valid (Without Sending One)
You can check if an email is valid without sending a message by testing its format, domain mail…
What is a mail transfer agent (MTA) and how does it affect deliverability?
TL;DR: A mail transfer agent (MTA) is the mail server software that moves messages between hosts over SMTP.…
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