メールに添付ファイル

Messaging.EmailFileAttachment efa = new Messaging.EmailFileAttachment();
efa.setFileName('attachment.pdf');
PageReference pdf = Page.attachmentPDF;
pdf.getParameters().put('id',(String)account.id);
pdf.setRedirect(true);
Blob b = pdf.getContent();
efa.setBody(b);
email.setFileAttachments(new Messaging.EmailFileAttachment[] {efa});