SPUtility.SendEmail truncates your message body
Use this instead to send longer emails from SharePoint:
MailMessage message = new MailMessage();
message.From = new MailAddress(list.ParentWeb.Site.WebApplication.OutboundMailSenderAddress);
message.To.Add(new MailAddress("email@email.com));
message.Subject = "Subject";
message.Body = "Body";
SmtpClient smtpClient = new SmtpClient(SPContext.Current.Site.WebApplication.OutboundMailServiceInstance.Server.Address);
smtpClient.Send(message);
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