Why your first week of sending should look nothing like your fifth

Gmail and Outlook don't trust a mailbox just because a human owns it. A brand-new inbox, or one that's been quiet for months, has no sending history, and providers treat that as a risk signal.

The fix isn't clever copywriting, it's pacing: a handful of emails a day at first, ramping up gradually over a few weeks as the mailbox builds a track record of being opened and replied to rather than reported.

This is invisible to the sender when it's done right: you just see a daily send cap that quietly climbs on its own. It's also the single most common reason a technically well-written campaign still ends up in spam.