Signature0

Signature0 is email design and sending software for agencies and freelancers who run email for several client brands. Each client brand gets its own system: colors, type, logo and reusable email sections, kept separate from every other client. Emails are built in a visual canvas, previewed privately, and sent as campaigns from a verified Signature0 sender, so neither the agency nor its clients need DNS setup or their own email provider account. A Free plan covers 1 brand and up to 300 emails a month after sender review. Studio is $49 a month for 3 brands and Agency is $99 a month for 10 brands, with no overage charges.