Picking a transactional email provider feels like a five-minute decision — add an API key, send your first signup confirmation, move on. It stays a five-minute decision until you scale, at which point the plan you casually picked can turn into a migration project: rewriting send logic, re-verifying DNS records, hoping deliverability doesn't dip mid-cutover. It's a worse time than usual to rely on an old comparison, too — Amazon SES quietly restructured its entire pricing model on July 21, 2026, ...