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How to good design email service.
With little-to-no understanding of how email systems work, I recommend purchasing a subscription. No hard feelings, please, but I personally use a hosted solution, such as SendGrid.
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Can you give me a suggestion for doing good design, process?
With email systems, it is basically sending the messages. There is no object-oriented or service-oriented way of doing this. You can however, always read more on the products such as Microsoft Exchange and see how they did the basics on this.
Exchange 2010 White Papers – 250 Hello[
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Which protocol is useful to email service?
This question is the base for my answer, oh, and it is SMTP.
Read more on this topic here,
Simple Mail Transfer Protocol - Wikipedia[
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Here are a couple of my articles/code samples to help you get started with the basics of email sending in .NET environment,
Sending emails over .NET framework, and general problems – using C# code[
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Universal SMTP Code to Send Emails in .NET Apps[
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How to increase security and I am using HMAC256?
There are several ways to handle this, and it depends entirely on how your users consume your services—Web API vs web application. You can check how API based authentication works, and how a web application authenticates the users, mostly using cookies.
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How to design Auto email notification?
Triggers, schedulers, services, CRON, etc. etc. etc.
cron - Wikipedia[
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I will say this again, just buy a subscription and you will be good to go. Most service providers come with 5-10k free emails per month and 1-3 free mailing groups to handle, so you will be in good hands.
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