Written by This post demonstrates how to send an email from CRM 2011 using C# code.
There are 4 steps in achieving this:
(a) Create the ‘From:’ activity party for the email
(b) Create the ‘To:’ activity party for the email
(c) Create an e-mail message
(d) Create the request to send email
//Namespaces need to include
using Microsoft.Xrm.Sdk;
using Microsoft.Xrm.Sdk.Query;
using Microsoft.Xrm.Sdk.Discovery;
using Microsoft.Xrm.Sdk.Messages;
using Microsoft.Xrm.Sdk.Client;
using Microsoft.Crm.Sdk.Messages;
//(a) Create the ‘From:’ activity party for the email
ActivityParty fromParty = new ActivityParty
{
PartyId = new EntityReference(SystemUser.EntityLogicalName, _userId)
};
//(b) Create the ‘To:’ activity party for the email
ActivityParty toParty = new ActivityParty
{
PartyId = new EntityReference(Contact.EntityLogicalName, _contactId)
};
//(c) 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
};
//(d) Create the request to send email
SendEmailRequest sendEmailreq = new SendEmailRequest
{
EmailId = _emailId,
TrackingToken = “”,
IssueSend = true
};
SendEmailResponse sendEmailresp = (SendEmailResponse)_serviceProxy.Execute(sendEmailreq);
//#########################################################################################
//Here is the 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(“<Contact Record ID>”);
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);
}
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Dynatecon Solutions 
MailMessage mail = new MailMessage();
string to = txtMailTo.Text;
string from = txtMailFrom.Text;
string subject = txtMailSub.Text;
string body = txtMailBody.Text;
MailMessage message = new MailMessage(from, to, subject, body);
message.IsBodyHtml = true;
SmtpClient client = new SmtpClient(Host, Port);
client.DeliveryMethod = SmtpDeliveryMethod.Network;
client.Send(message);
a good reference with example : http://cybarlab.blogspot.com/2013/03/send-e-mail-using-c-sharp.html