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So this time around, I want to explore how we send emails using Go and Go does have some functionality



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built into the standard library that allows us to send email, but it's not ideal.



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Nevertheless, you should be aware of it.



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So what I'm going to do is right here in my mango file, I'm going to hard code right in this part right



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here.



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Just after we deferred the closing of our database connection pool, I'm going to write code so that



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when the program starts, it sends a test email.



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So how do we do that?



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Well, it's not that hard.



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First of all, you need a from address.



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Who's the mail from?



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So I'll just create a variable called from and it's going to be assigned the value of me here dot com.



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So now I have a firm address.



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Now, according to the functionality in the standard library, we must have some means of authenticating



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with the mail server.



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We have to give our credentials, if any, to email server that will allow us to send messages.



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So I have installed and you don't yet, but don't worry about it.



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I have installed a test mail server called Mail Hug, unfortunately named but extremely helpful when



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you're developing and sending text messages.



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And I'm going to create my authentication against that.



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So you don't need to do this.



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You don't need to do any of this at all because we're not going to be using this this mail functionality.



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But I'm just showing you that it exists.



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Orcadian authentication called off and it's using a package built into the standard library called SMTP,



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which stands for simple mail transfer protocol.



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And I'm going to use the plane off and it requires some arguments.



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First of all, it requires the identity.



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Well, I'm using a test mail server.



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There is no identity.



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Then it requires a username.



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And I'll just use my from email because it just just has to be in the form of an email address.



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Then it requires a password for the mail server, if any.



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I'll leave that empty because I'm using a test mail server.



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Then it requires a server name and I'm going to use localhost, which you will be using once you install



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the test mail server.



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But don't worry about it for right now.



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And that that's all that's required for arguments for the off package.



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Now, I will actually create and send an email message in one step, so I'm going to check for an error.



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And then I call SMTP dot sendmail and it requires an address.



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And in this case, the addresses of four hour server and the server is localhost and I'm listening on



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Porten twenty five and you will be as soon as you install the necessary package then it requires the



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auth that we just to find off then it requires the from address which we have from then it requires



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the recipient's address and for that we can use a slice of strings.



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And I'm just building that in one step and I'll send it to you at their dot com.



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As long as it's formatted as an email message that will work for our purposes right now.



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Finally, we need the actual content of the message itself, which is a slice of bytes.



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So in that slice of bytes, I will just put Hello World.



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So that sends the message and it's not going to be very pretty and it's not going to have a subject



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or anything like that.



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But I'm just demonstrating to you that there is functionality in the standard library for sending messages



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so we check for error.



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If error is not equal to nil, just log the error.



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OK, let's run this.



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So I run the application, don't run it starts up and hopefully it actually sent the message.



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Let's find out.



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So I would go to my test mail server, which is on localhost 80, 25.



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And there's a message badly formatted, that's what it used for the actual subject, but it doesn't



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matter.



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We're not going to be using this package.



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I just want to show you that it exists.



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And there is a message that I sent in plain text, not nicely formatted HTML.



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As you can see, there are some limitations in the standard libraries, mail functionality.



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So what we're going to do instead is in the next lecture or two will be installing a sample or a good



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package for sending and sending emails using go.



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And then we'll go through the process of allowing ourselves to send an email from anywhere in our application



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at any time to anyone we want.



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And that will take a little while.



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But we'll do that in the next few lectures.