Perform a DNS lookup against multiple widely used nameservers around the world.
"250ok has built a best-of-breed platform that addresses the concerns of today's data-driven marketers."
VP of Industry Relations at SendGrid
Instantly check an IP or domain against major email blacklists including Spamhaus, SURBL, SORBS, and more.
Enter a CIDR notation to instantly convert it to an IP range.
SPF is a method to prevent email sender address forgery. Enter your domain to analyze its SPF record.
Enter a IP range to instantly convert it to a CIDR notation.
When sending commercial email, it’s important to understand what’s likely to happen the next time you send to a recipient at a particular mailbox provider. Are your messages hitting SPAM at Yahoo! or going missing at Comcast? Are you sacrificing ROI because you lack the proper visibility into performance? Seedlist-based inbox monitoring is a key […]
Marketers are often confused about the point of IP and domain warming, and they end up wondering: “Everything is authenticated, and I’m not using a blacklisted IP, so what’s the problem?” In short: senders who blast to their entire list without history look like spammers. Internet service providers (ISPs) can choose what to accept or […]
We’re often asked about our stance on the use of email panel data. As senders, we want additional data points, visibility, and signals. In a perfect world, email panel data would enable marketers to compare their engagement to that of their competitors within a contextually relevant group of subscribers. Collected ethically and without bias, this […]