Bulk email How-To's
From HAA Best Practices Wiki
WARNING: Most of the template sites are hosted at Siteground. Siteground has a bug in their Sendmail binary. You will hit this bug if you configure your site to use Phpmailer or Sendmail AND you configure CBMailing to put the recipients addresses in the BCC field. The problem is that the mail goes out ok, but the bcc email addresses aren't hidden.
If you are on Siteground, your site should be configured to use SMTP and thus avoid the problem. As delivered the sites are configured to avoid this, so this message is really a warning to those who might be thinking of refonfiguring the mailing options.
