We prefer using the server’s local built-in MTA (e.g, Sendmail or Exim) as it is generally faster than connecting to an SMTP server.
Sendmail does not exist for Windows servers, so you will need to connect to an SMTP server. And if that is on the same box as arpReach, then it will be fast.
We do not have any recommendations on specific SMTP service providers to use. Your web host can assist you with that.
Some remote SMTP service providers who can manage your delivery for you include:
- Amazon SES