![]() It's very powerful that Inbound Parse will process all the emails sent to a subdomain, not just to specific email addresses. For example, when you do not have direct access to the source of the files, they can only be received by email. Using Inbound Parse, you can automate processes and receive attachments. You can process incoming emails with the Inbound Parse feature provided by Twilio SendGrid. Saving incoming email attachments to disk If you plan to not use an accept-list, make sure that your code is not vulnerable to file path injection. Once you have configured Basic Auth to your liking, update the webhook URL in the SendGrid Inbound Parse settings to include the username and password like this: Currently, the rules spell out what file names are allowed, which works as an accept-list. For example, this Basic Auth library by Barry Dorrans. ASP.NET Core does not have built-in support for Basic Authentication because it is dated, but you can add a library to add Basic Auth support. One way to prevent this, is by adding Basic Authentication to your Web API. Bad actors could send HTTP requests with malicious files to your application, hoping someone would open the files and thus infect their machines. This also means anyone could submit HTTP requests to your application, including bad actors. For SendGrid to forward the emails to your web application, your application has to be publicly available.It's also very important to secure your application before running it in production: This would make the application more configurable and easier to deploy. NET configuration or retrieve them from a database. ![]() Instead of hard-coding the rules, you could store the rules in the.You could improve this solution by including the current date and time into the filename, or something similar to ensure the uniqueness of the filename. This could potentially lead to loss of data. Currently, when a second email with the same sender, subject, and attachment comes in, the new file from the attachments will overwrite the existing file with the same name.This is a great start, but you can improve the solution further: Here you can see an example (remember to adapt the names and subjects according to your rules):Ī few seconds after sending the email, you will see the file appear in your folder inside SendGridFiles. To do this, send emails to the email addresses, with the subjects, and file name attachments that you defined in your rules within the code. Now it's finally time to test the solution. Configure SendGrid Configure SendGrid to receive emailĪlthough the domain authentication is already complete, you also need to configure your DNS server to send the emails to SendGrid by adding an MX record to your DNS Server.Īdd the MX record with your new subdomain (do not do it with your main domain, otherwise you will no longer receive your emails), indicating a priority of 10 and with the address mx. ![]() The reason why you are iterating is that it could be the case that the same email can comply with more than one rule and under those conditions, different files must be managed. If an email does not meet any rule, it is ignored. If it applies, the action creates a copy of the attachment in the path and folder specified in the rule. ![]() Then, the Post action checks all the rules that apply for the same file, subject, and recipient. The Post action will retrieve the To and Subject fields, and the email attachments as form files. When SendGrid receives an email, SendGrid will submit the email to the Post action using form-encoding. Open a console terminal and run the following command: The first thing you will need to do is to create your Web API using the. You can find the source code of this tutorial in this GitHub repository. A public domain and access to your domain's DNS Server.NET IDE ( Visual Studio, VS Code with C# plugin, JetBrains Rider, or any editor of your choice) Sign up here to send up to 100 emails per day completely free of charge.Īdditionally, the API that you are going to create needs to be publicly exposed to be accessed from Twilio SendGrid, in this tutorial you will use ngrok to test your application without the need to deploy it in cloud hosting.įinally, you will need the following for your development environment: To complete this tutorial, you will need a free Twilio SendGrid account and experience working with ASP.NET applications using the C# language. In this post, you are going to learn how to organize and associate files that users send by email to a particular mailbox through Twilio SendGrid with an API built in ASP.NET. Generally, these files arrive by email to a default mailbox that is constantly monitored, but manually. At times, people in many organizations must organize and associate files (such as accounts, invoices, and more) with each employee or vendor in the company.
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