I am working on a blazor server app as a database frontend for a company. The app will be running on IIS, connected to SQL Server via Entity Framework and standard login via .NET Identity. The hosting server is only connected to the local network, not the internet. The clients accessing the app are connected to the internet (and obviously the local network).
Depending on the user input, I want to automatically send out e-mails, this is the part where I really lack knowledge. From my research I (believe to) understand:
- if the companies e-mail server is hosted within the network, I could connect to that server over SMTP, using IP, Port and a login?
- if their e-mail server is managed by a e.g. Gmail oder MS 365 server, I have no chance to connect via SMTP since I can't reach that server without internet access
- if 2. is true, I could work with a local service on the client side, that monitors the database or some form of request directory, where the server app could put e.g. xmls for the client app to parse to the local windows user context and outlook of the user (which requires additional installations and always uses the users e-mail account instead of a central address the server app could handle)
If you'd like to share your ideas or expertise concerning this problem, or know about some good blog posts etc., I would be happy to hear what you think. I'm not certain which way to go concerning research as well as design and not even talking implementation yet. Thanks!