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In the blog I’m working on currently whenever an user posts a comment for an article I like to send emails to all the other users commented for that post. What is the best way in sending mails in this case either synchronously or asynchronously? Can anyone share a code snippet for sending email to a list of users using System.Net.Mail in .NET.
You might want to use a separate webservice for sending emails. You app will send the body and email list to the webservice. You can use gzip or zip compression. This would make the webservice call very efficient(70%+ compression as the data is text).
Now in the webservice you can use multi-threading or Async operations for sending emails.
Edit: If you have a dedicated server, making a windows service might be a better option. Make a two tables in sql server, Queued Emails and Send Emails(Archive). So whenever user posts a comment, update the Queued emails table. Now the windows service can wake up every 30 seconds, extract all the rows from Queued emails and async send all of them. After an email is send, move/remove the row from the table.