If you are currently using our IIS SMTP Server Method, you may wish to migrate to one of the options above.

Migrating to Option 1 (A&B) – Amazon AWS would be a ‘like for like’ replacement but would offer enhanced features such as DKIM and supporting sending over SSL/TLS. You could also migrate to Option 2 – SMTP Relay and you would benefit from your internal protocols and policies for your email servers.

Options 3 & 4 (Reply To methods) should only be considered if you cannot implement Options 1 or 2 as they give a reduced user experience.