[SSMTP]How to make ssmtp ignore errors in CC list?

[jueljust]

i've config ssmtp.conf file to send mail, i basicllay work well.
Just one thing, if there's any mail adress in the CC list is not exsits or failed
the whole mail will not be send even the To mail adress is ok.
how can i make ssmtp ignore these errors just send the mail and notify me some mail in CC list send failed like most mail service provider doing?

regards