How can legitimate senders get caught in spam filters?

Poor list practices trigger filters: purchased lists containing **spam traps**, unconfirmed signups including invalid addresses, and stale lists with abandoned accounts. List quality problems resemble spammer behavior.

Content triggers include: spammy phrases ("Free!" "Limited time!"), excessive links, image-heavy layouts, and missing unsubscribe links. Legitimate marketing sometimes uses language similar to spam.

Reputation damage from past issues persists. Previous problems, shared **IP reputation**, or domain history can affect current sending. Understanding why you're filtered helps address root causes rather than symptoms.