SPF is a method to prevent email sender address forgery.
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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.
We’ve partnered with the inimitable Lauren Meyer, Mailjet’s global VP of delivery & head of operations, North America, to bring you a series of blogs about validation, one of the most misunderstood yet incredibly powerful tools in an email marketer’s toolbox. We’ll start with the basics. What is List Validation? In short, list validation can […]
Guess who’s back, back again? It’s Matthew Vernhout, director of privacy at 250ok, with an all-new DMARC report for 2019! Tell a friend. Yes, this year we’re looking at how DMARC adoption rates fluctuated between our first glance at them in 2018 for a number of industries as well as taking a peek at different […]
At this point, we sound like a broken record but we’re 250ok with that. We think confirmed opt-in, or double opt-in, practice is the most basic standard for marketers to implement. If you’re asking someone to take an action to confirm their interest, and they do it, you can be relatively sure they’re in this […]