Sendmail SMTP server outgoing email rate

[Aflatoon Aflatooni]

Hi,
Is there a way that I could configure sendmail so that I could control the rate of outgoing emails?
For example if there are 2 outbound emails destined for Yahoo.com server then they would be sent one connection at a time so that it is not flooding their server.

Also, is there a limit on the incoming connection for sendmail? 


Thanks