Will the mailing list program be in demand and are there any analogues?

Question

Xamarin

I sometimes do mailing lists. I rent an apartment and periodically need to look for new guests. Received mailing addresses from websites of brokerage services. They have agency names and broker names with mailing addresses, so sending them my information is not spam. Other users may have their own tasks and their own mail databases. The problem was that you need to send messages to a fairly large number of addresses. In my case, 25 thousand. I did not find a service that would do this - maybe I was looking badly? For reliable delivery of letters, the option was chosen to send through well-known mail servers. Mailing through your SMTP sent many emails to spam. I began to use mail from google, i.ua and so on. The problem is that all such services allow you to send no more than 1000, but mostly 300-500 messages per day and not at once. I tried through Gmail, there is the ability to send to the contact list. Created 500 contacts and sent, my email address was blocked. The solution was the following: open the mailing address and write an independent mailing list through its SMTP, sending a letter, for example, every 3 minutes. This resulted in 480 emails per day from a good address, which guaranteed not to be spammed. By creating several addresses and sending through them, we managed to increase the number of shipments. In addition to sending, the program preliminarily tested the addresses, checked whether the domain in the mail was working and controlled incoming messages for the impossibility of delivery and entering these mail addresses into the database to exclude them in the future. Plus, the recipient's click on the message was controlled. Everything works great on the site I made. I've been programming for a very long time and implementing a C#/MVC/Angular site... was not difficult. I have been making many android/ios/uwp mobile applications... using Cordova. I decided to expand my capabilities by starting work with Xamarin. Now the actual question is whether it makes sense to implement a program for mobile devices and computers? I do not hope for profit, it will just be a shame if no one needs it. Perhaps the task before me is quite specific and no one needs it. It is not suitable for making money on spam - not the number of mailings. if no one wants it. Perhaps the task before me is quite specific and no one needs it. It is not suitable for making money on spam - not the number of mailings. if no one wants it. Perhaps the task before me is quite specific and no one needs it. It is not suitable for making money on spam - not the number of mailings.

Answer 1

www.mailwizz.com
see functionality, look for someone to offer your option, but due to the low cost of mailing services, this is of little relevance