Gmail Promotions Tab: Annotations Preview

Email annotations bring your promotions to life with images, deals, expiration dates and more.

Blacklist Checker

Instantly check an IP or domain against major email blacklists including Spamhaus, SURBL, SORBS, and more.


Use Blacklist Checker


CIDR to IP Range

Enter a CIDR notation to instantly convert it to an IP range.


Use CIDR to IP Range

SPF Analyzer

SPF is a method to prevent email sender address forgery. Enter your domain to analyze its SPF record.


Use SPF Analyzer


IP Range to CIDR

Enter a IP range to instantly convert it to a CIDR notation.


Use IP Range to CIDR

DMARC Wizard

Enter your domain to analyze your DMARC record or create a DMARC policy for your domain.


Use DMARC Wizard


DNS Lookup

Perform a DNS lookup against multiple widely used nameservers.


Use DNS Lookup

Resources for #SeriousSenders


Are inbox placement rates improving or declining across the world?

Do you know your inbox placement rate (IPR)? If you don’t, yikes, we really need to talk. But if you do, have you wondered how it compares against other senders? We’re always thinking about things like this, so we did a big data dump and jumped right into it. We looked at global IPR over […]

Email Experts Series: BIMI 101

We’re always working to stay innovative and at the very forefront of email technology. That’s why we’re proud to be a part of the Brand Indicators for Message Identification (BIMI) working group! However, since it’s a newer feature available only at a select number of mailbox providers right now, the requirements and benefits still aren’t […]

How do I seed test my triggered email?

Transactional or otherwise triggered email messages are likely some of the most important messages your organization sends to your clients or users. The definition of “triggered email” can vary, but for the purpose of this article, I’m going to refer to any type of message sent outside of a large-scale, “batch-and-blast” deployment, as triggered mail. […]




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