How to Run a Telnet SMTP Test Without Misreading the Results
What’s the simplest way to find out whether a mail server is actually accepting your email? Open a…
Email Infrastructure
⌄Practical guidance on setup, configuration, and compliance across SMTP, DNS, authentication, IP reputation, and the systems that power email delivery.
Latest articles
Mimecast SMTP Relay: What It Does and How to Use It
Whether you’re setting up a mail flow for Exchange, an app server, or an IDP like miniOrange, Mimecast…
Strategies For Using Microsoft SNDS For Email Deliverability Success
Have you ever clicked “send” on an important campaign and watched your open rates go flat as your…
SPF MX: Everything You Need to Know
Ensuring the security and authenticity of electronic communication is a paramount concern. Among the arsenal of tools designed…
Remote Server is Misconfigured Error: How to Fix It
Imagine that you’re reaching out to various leads about your new product or service. After personalizing each email…
“5.x.0 Message Bounced by Administrator” – What Does it Mean?
The “5.x.0 – message bounced by administrator” falls into the “what now?” category, mainly because it’s so vague.…
Amazon SES SPF Record: Best Practices for Better Inbox Placement
You’d think email authentication would be simple: set up an Amazon SES SPF record, publish a few records,…
SPF PTR: All You Need to Know
Ever wondered how emails stay safe from scammers and hackers? That’s where SPF PTR comes in. SPF PTR…
550 5.7.0 Message Size Violation? Here’s How to Solve It
You draft an email, attach the files, press send, and back it comes with a 550 5.7.0 message…
What Does Queued Mean In Gmail? (And How to Fix It)
If you’re an active Gmail user, one of the most annoying things that can happen is a “queued”…