FluentEmail | Supports popular senders | Email library

I'm using FluentEmail to send emails, everything is working well except there's this issue where the 'To' recipients keep getting added for every subsequent email.

For eg: If it's sending emails to someone@abc.com:

1. The first time the SendEmailAsync method is called, it sends email to: someone@abc.com

2. The second time the SendEmailAsync method is called, it sends email to: someone@abc.com;someone@abc.com

3. The third time the SendEmailAsync method is called, it sends email to: someone@abc.com;someone@abc.com;someone@abc.com

and so on. It gets really long after some time.

My code looks like this:

ConfigureServices method:

I'm trying to unit test FluentEmail, but I keep getting null in the send response.

This is how it's set up in the ConfigureServices method:

I have an ASP.Net MVC application (targeted for .Net Framework 4.7.2).

I installed FluentEmail.Core, FluentEmail.Smtp and FluentEmail.Razor (all of them version 3.0.0)

FluentEmail.Razor required LightRazor version 2.0.0-rc3, I had to manually install it since nuget default settings will only download final release (at the time of posting this question, the final stable release of RazorLight is version 1.0.0 which does not meet the requirement of FluentEmail.Razor v 3.0.0).

In my code, I am sending emails with no issues like this:

I'm creating a .NET 5 worker service app that watches few other apps and sends email when required. I'm using FluentEmail to send those emails and everything works fine, until I deploy the app.

When I deploy the app and it attempts to send an email, it throws this exception:

I have created my first WPF project and it is written in .NET framework 4.7.2

I have NO idea about the importance and functionality of this however I want to be able to install it in a few businesses with as little chance of them needing to install a new framework. Perhaps that isn't important and I should just include it in the installer, but that is what I am not sure of.

I tried rolling back to 4.5 .NET however now one of my packages will not install on that framework.

Install-Package : Could not install package 'FluentEmail.Mailgun 2.8.0'. You are trying to install this package into a project that targets '.NETFramework,Version=v4.6', but the package does not contain any assembly references or content files that are compatible with that framework. For more information, contact the package author.

If I do any framework lower than 4.7.2 I can't see to run this, however I can't find documentation referring to this needing a specific framework to run.

Any pointers in the right direction would be helpful, eg. Is the framework important for a basic WPF app not using any crazy tech, just a few API's and mainly data storage? Can I force this package to install on an earlier based framework or is that going to fail?

I have an Azure Function that doesn't run in Azure. Locally it runs, but in Azure it doesn't. I have a try/catch in place, which doesn't catch any exception, but in the logs I get "2020-07-26T12:23:00.021 [Error] An exception occured." Don't understand what I'm doing wrong.