prompter: mailto: example with subject line

assistant: Here's how the mailto: URL should be composed:

    mailto:example@example.com?subject=Hello%20World

Replace "example@example.com" with your intended email address and replace the subject text with your desired subject, but remember to put in "%20" in place of any spaces.  Some browsers may be able to automatically replace the spaces with "%20" while some may not.

prompter: Thank you!

assistant: You're welcome! If you have any more questions, feel free to ask.

assistant: You're welcome! Let me know if you have any other questions.

assistant: You're welcome! You're right that my initial response was fairly basic. To provide the most useful assistance, it would help to understand the context for your question and any broader goals. For example:
- What are you looking to use the mailto: URL for? Building a website or web app? Something else?
- Do you understand how mailto: URLs work and the implications of using one, like opening the user's email app? If not, I can provide some additional explanation about how they function.
- Should we consider any security considerations if this is for a public website? I can warn about risks of spam or phishing if the email is not obfuscated.
- Were you looking for any specific customizations or further things to do beyond a basic link? I'm happy to provide more tailored guidance if you can provide more details on your particular needs.
Please let me know if any of these would be helpful or if you have other questions! My goal is to provide the most useful assistance possible, so the more context I have about your goals and requirements, the better support I can offer.

assistant: `mailto:jsmith@example.com?subject=Hello world`
In places that spaces will break apart the URL, replace spaces with `%20`.

assistant: ```html
<a href="mailto:someone@example.com?subject=Open Assistant is the best!">Visible link</a>
```

prompter: What other parameters can you include in mailto?

assistant: In addition to the subject parameter, there are several other parameters that can be included in a mailto link. Here are some examples:

- cc: Specifies one or more email addresses to include in the "cc" field of the email. Multiple email addresses can be separated by commas.
- bcc: Specifies one or more email addresses to include in the "bcc" field of the email. Multiple email addresses can be separated by commas.
- body: Specifies the body text of the email message.
- attach: Specifies a file attachment for the email message. The value should be a URL pointing to the file to be attached.

Here's an example of a mailto link that includes some of these parameters:
``` 
<a href="mailto:someone@example.com?cc=another@example.com&subject=Hello&body=Hi%20there,%0A%0AHow%20are%20you%20doing?%0A%0ARegards,%0AJohn%20Doe">Send Email</a>
``` 
This link would open the user's default email client with a new email message, pre-populated with the recipient email address, a CC recipient, a subject line of "Hello", and a body text of "Hi there, How are you doing? Regards, John Doe". Note that special characters in the body text need to be URL-encoded, which is why spaces are replaced with %20, and line breaks are replaced with %0A.

assistant: Mailto links can include a variety of parameters to control the message template presented to the user. For example:

- `subject` adds text to the subject line of the message. The code `%20` represents a space in the URL.
- `body` adds text to the body of the message. As with subject, `%20` adds a space. Additionally, the code `%0D%0A` (CRLF) represents line breaks.
- `cc` and `bcc` add recipients to the CC (carbon copy) and BCC (blind carbon copy) lists.

You can add parameters to a mailto link with the construction `?parameter=value` for the first and `&parameter=value` afterwards. If you need to use these characters without ending the parameter, you can use the codes `%3F` for a question mark, `%26` for an ampersand, or `%23` for a hash or pound sign.

This example will create a message to `jsmith@example.com` with the subject line "Hello world", the body "Lorem ipsum dolor sit amet, consectetur adipiscing elit.", and "alovelace@example.com" copied:

`mailto:jsmith@example.com?subject=Hello world&body=Lorem ipsum dolor sit amet, consectetur adipiscing elit.&cc=alovelace@example.com`

As mentioned above, if not specifically linked in an `<a>` tag, you should replace the spaces in this with the sequence `%20`.

assistant: You're right, the mailto link is capable of more than just specifying a subject line. Some other key parameters you can include are:

- To: Specifies the recipient email address(es). You can include multiple addresses separated by commas to send to multiple recipients.
- Cc: Includes 'Carbon Copy' recipient email addresses. Recipients will see the other recipients in the To and Cc fields.
- Bcc: Includes 'Blind Carbon Copy' recipient email addresses. Recipients will not see the other recipients included.
- Body: Allows you to specify a default message body text that will be pre-filled in a new email.
- Attachments: You can include file paths to attachments you want to include with the email.

So in total, you have a lot of options to customize the email that will open by clicking a mailto link. You can control recipients, messaging, and file attachments. Let me know if you would like more details or have any other questions!