Navish Jain MS Dynamics CRM Consultant

In this article , I am going to explain how to send an email

Create the 'From:' activity party for the email
ActivityParty fromParty = new ActivityParty
{
    PartyId = new EntityReference(SystemUser.EntityLogicalName, _userId)
};

Create the 'To:' activity party for the email
ActivityParty toParty = new ActivityParty
{
    PartyId = new EntityReference(Contact.EntityLogicalName, _contactId)
};

Create an e-mail message
Email email = new Email
{
    To = new ActivityParty[] { toParty },
    From = new ActivityParty[] { fromParty },
    Subject = "e-mail",
    Description = "SendEmail Message.",
    DirectionCode = true
};

Create the request to send email
SendEmailRequest sendEmailreq = new SendEmailRequest
{
    EmailId = _emailId,
    TrackingToken = "",
    IssueSend = true
};

SendEmailResponse sendEmailresp = (SendEmailResponse)_serviceProxy.Execute(sendEmailreq);


Complete Code
using (OrganizationServiceProxy _serviceProxy = new OrganizationServiceProxy(serverConfig.OrganizationUri,
                                                    serverConfig.HomeRealmUri,
                                                    serverConfig.Credentials,
                                                    serverConfig.DeviceCredentials))
{
    _serviceProxy.ServiceConfiguration.CurrentServiceEndpoint.Behaviors.Add(new ProxyTypesBehavior());

    Guid _contactId = new Guid("67B45Cdf-C56F-456F-B145-1237435430E6");

    WhoAmIRequest systemUserRequest = new WhoAmIRequest();
    WhoAmIResponse systemUserResponse = (WhoAmIResponse)_serviceProxy.Execute(systemUserRequest);
    Guid _userId = systemUserResponse.UserId;

    // Create the 'From:' activity party for the email
    ActivityParty fromParty = new ActivityParty
    {
        PartyId = new EntityReference(SystemUser.EntityLogicalName, _userId)
    };

    // Create the 'To:' activity party for the email
    ActivityParty toParty = new ActivityParty
    {
        PartyId = new EntityReference(Contact.EntityLogicalName, _contactId)
    };

    // Create an e-mail message.
    Email email = new Email
    {
        To = new ActivityParty[] { toParty },
        From = new ActivityParty[] { fromParty },
        Subject = "e-mail",
        Description = "SendEmail Message.",
        DirectionCode = true
    };
    Guid _emailId = _serviceProxy.Create(email);

    // Use the SendEmail message to send an e-mail message.
    SendEmailRequest sendEmailreq = new SendEmailRequest
    {
        EmailId = _emailId,
        TrackingToken = "",
        IssueSend = true
    };

    SendEmailResponse sendEmailresp = (SendEmailResponse)_serviceProxy.Execute(sendEmailreq);
}