Currently It's not official provider in @strapi scope. But you should install package as @strapi/provider-email-freshmail for catch by Strapi.
# using yarn
yarn add @strapi/provider-email-freshmail@npm:strapi-provider-email-freshmail
# using npm
npm i @strapi/provider-email-freshmail@npm:strapi-provider-email-freshmail --save
Path - config/plugins.js
module.exports = ({ env }) => ({
// ...
email: {
config: {
provider: "freshmail",
providerOptions: {
token: env("FRESHMAIL_TOKEN"),
},
settings: {
defaultFrom: "no-reply@domain.pl",
defaultFromName: "Your company",
},
},
},
// ...
});