Send e-mail with SMTP (Office 365)

Question

I need to show a popup-window with a basic e-mail layout and send the e-mail after pressing the send button. The popup, I've created and also the webpart within. But when I want to send the e-mail, it crashes at the following line:

SmtpClient client = new SmtpClient(SMTP_HOST, SMTP_PORT);

With SMTP_HOST and SMTP_PORT the settings from my exchange online account:

private const string SMTP_HOST = "pod51014.outlook.com";
private const int SMTP_PORT = 587;

Error:

System.Security.SecurityException: Request for the permission of type 'System.Net.Mail.SmtpPermission, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed. at System.Security.CodeAccessSecurityEngine.Check(Object demand, StackCrawlMark& stackMark, Boolean isPermSet) at System.Security.CodeAccessPermission.Demand() at System.Net.Mail.SmtpClient.Initialize() at System.Net.Mail.SmtpClient..ctor(String host, Int32 port) at ...

Does anyone know what's my problem here?

Answer 1

You can't use the System.Net.Mail namespace or SPUtility.SendEmail with Office 365/Sandbox solutions.

SPSE - Send email via code in Office365