What is a “probation period” for new senders?

A probation period is the initial phase when new senders face heightened scrutiny from mailbox providers. During this time, filters apply conservative defaults because there is no track record to evaluate.

New IPs and domains typically cannot send high volumes immediately. Providers impose implicit rate limits that constrain how much mail they will accept. Exceeding these limits triggers deferrals.

Filtering sensitivity is higher during probation. Content that would pass from an established sender may be filtered from a new one. The sender has not earned the benefit of the doubt.

The probation period is why warming is necessary. Gradually increasing volume while maintaining engagement builds the track record that ends probation.

Duration varies by provider and behavior. Clean sending with good engagement shortens probation. Problems extend it or prevent graduation entirely.

Probation is the proving ground. New captains must demonstrate competence before being granted full harbor access.