func NewMailClient(cfg config.Config) (MailClient, error) {
switch cfg.OptEmailService() {
case "none":
return NewNoOpMailClient()
case "sendgrid":
username := cfg.OptSendgridUsername()
secret := cfg.OptSendgridSecretKey()
return NewSendGridMailClient(username, secret)
default:
return nil, fmt.Errorf("Unsupported mail service: %s", cfg.OptEmailService())
}
}
