Cannot send to twc emails with my gmail account
All of a sudden I cannot send emails to anyone with a twcny.rr.com account from my gmail acccount. I'm not sending to multiple people, just one person at a time. My father has a twc account and it gets blocked, a friend of mine also has a twc account and every time my email to her gets blocked. I could see if I were sending to multiple people I would have this problem becuase it would think I was sending spam, but I'm not! Any help would be appreciated.