Sendmail, dynamic ip causing errors - how to resend via ISP
I'm on a home computer and running sendmail. Sometimes I get some emails back telling me that the email has been rejected because it came from a dynamic IP.
Is there any possibility of detecting this, and then re-send the mail via my ISP's mailserver? I don't want to send all my emails via my ISP's mailserver because I sometimes send bulk mailings, and I don't think they like it. However, only 3% of the emails returns with the dynamic ip-error.