Articles, analyses, and operational notes from the Iscope team. Written for marketers and growth leaders who want sharper answers than "it depends."
Purchased lists have a reputation for landing in spam — but that’s usually a result of how they’re used, not an inevitability. With the right practices, you can keep emails to a bought list reaching real inboxes. Here’s how to stay out …
One of the fastest ways to ruin a purchased list is to blast it from a brand-new or cold email domain. Without warming up first, you risk landing in spam and damaging your sender reputation from day one. Here’s why domain warm-up …
Phone data — especially direct dials and mobile numbers — is some of the most valuable and most difficult B2B data to get right. It can cut through where email fails, but accuracy and coverage vary widely, and there are compliance considerations …
Not all B2B data is the same shape. Some vendors sell basic email lists, others sell direct dials, and many offer full contact profiles combining both with company detail. What you should buy depends entirely on how you plan to reach people. …
When you email a purchased B2B list, some messages will bounce — the question is how many is acceptable. Bounce rate is one of the clearest signals of data quality and a direct threat to your sender reputation. Here’s what counts as …
If open rate is unreliable and you can’t directly see whether your email reaches inboxes, how do you actually know your deliverability? Inbox placement testing is the answer — a method for measuring where your email lands across mailbox providers before and …
A nurture sequence is supposed to move a lead from initial interest toward sales readiness — but get the length, volume, or cadence wrong and you either lose the lead to silence or annoy them into unsubscribing. The “right” answers aren’t universal; …
BIMI promises something marketers have long wanted: your brand logo displayed next to your emails in the inbox. But achieving it requires authentication work and, often, a paid certificate that costs real money annually. Is it worth it? This article explains what …
For two decades, the open rate was email marketing’s headline metric — the number reported to executives, used to judge campaigns, and optimized above all else. In 2026, it’s effectively dead as a reliable measure. This article explains why the open rate …
When Apple introduced Mail Privacy Protection (MPP) in 2021, it quietly broke one of email marketing’s most relied-upon metrics: the open rate. Years later, many email programs still report open rates as if they mean what they used to. This article explains …