Open Standard Email composer from LWC Component - Global Email Quick Action

SkStandardEmailComposer.html

<template>

    <lightning-card  title="Launch Standard Email Composer in LWC">
        <div style="background-color:#E6E6FA;border-style: solid;height:200px;margin:5%;padding:2%;">
            <lightning-button variant="neutral" label="Send an Email" onclick={onButtonClick}></lightning-button>
        </div>
    </lightning-card>

</template>

SkStandardEmailComposer.js

import { LightningElement , api, track} from 'lwc';
import { NavigationMixin } from 'lightning/navigation';
import { encodeDefaultFieldValues } from 'lightning/pageReferenceUtils';
import findEmailInfo from '@salesforce/apex/skStandardEmailComposerController.findEmailInfo';


export default class SkStandardEmailComposer extends NavigationMixin(LightningElement) {
    @api emailInfo;
    @api error;
    connectedCallback(){
        this.findEmailInformation();
    }

    findEmailInformation(){
        findEmailInfo()
            .then((result) => {
                this.emailInfo = result;
                console.log('***email details-'+JSON.stringify(this.emailInfo));
            })
            .catch((error) => {
                this.error = error;
            });
    }

    onButtonClick(){
        console.log('***onButtonClick-recordRelatedToId:'+this.emailInfo.recordRelatedToId);
        var pageRef = {
            type: "standard__quickAction",
            attributes: {
                apiName: "Global.SendEmail"
            },
            state: {
                recordId: this.emailInfo.recordRelatedToId,
                defaultFieldValues:
                encodeDefaultFieldValues({
                    HtmlBody : "Pre-populated text for the email body.", 
                    Subject : "Pre-populated Subject of the Email",
                    CcAddress : this.emailInfo.ccAddress.join(','),
                    ToAddress : this.emailInfo.toAddress.join(','),
                    ValidatedFromAddress : this.emailInfo.fromAddress,
                })
            }
        };

        this[NavigationMixin.Navigate](pageRef);
    }

   



}

SkStandardEmailComposer.js-meta-xml

<?xml version="1.0" encoding="UTF-8"?>
<LightningComponentBundle xmlns="http://soap.sforce.com/2006/04/metadata">
    <apiVersion>58.0</apiVersion>
    <isExposed>true</isExposed>
    <targets>
        <target>lightning__AppPage</target>
    </targets>
</LightningComponentBundle>

skStandardEmailComposerController.apxc

public class skStandardEmailComposerController {
    
    @AuraEnabled
    public static emailWrapper findEmailInfo(){
        emailWrapper returnValue= new emailWrapper();
        //you can implement your own logic to 
        returnValue.ccAddress.add('sk111111demo@gmail.com');
        returnValue.ccAddress.add('sk22222demo@gmail.com');
        
        returnValue.toAddress.add('skemailtocaseEmail1@gmail.com');
        returnValue.fromAddress='skcurrentUser@gmail.com';//make sure it is some user address or org wide address
        returnValue.recordRelatedToId=[select id from Account Limit 1].Id;
        
        return returnValue;
    }
    //in wrapper you can define define ccAddress,toAddress,from address, emailBody,EmailSubject
    public class emailWrapper{
        @auraEnabled
        public string recordRelatedToId;
        @AuraEnabled
        public List<string> ccAddress;
        @AuraEnabled
        public List<string> toAddress;
        @AuraEnabled
        public string fromAddress;
        public emailWrapper(){
            ccAddress = new List<String>();
            toAddress = new List<String>();
        }
        
    }

}