How can I send an email to multiple addresses without disclosing all addressees to the other recipients?

When using BCC, those addresses are not disclosed, but since Yahoo requires you to enter at least one visible address in the address bar, the mail sender should enter his own address as the first recipient.





Note: the limit is 100 addresses with no more than 50 going to the same domain.

How can I send an email to multiple addresses without disclosing all addressees to the other recipients?
use bcc.