How to fix 421 4.7.1 DYN:T1 postmaster AOL error message


EQ Forum Admin
Staff member

It appears that your email has been blocked because it's being sent directly from a residential & dynamically assigned IP address.

If you are paying for business class service and a static IP address contact your ISP to get this problem corrected.

If you are running a mail server at home try one of these solutions:

  • Configure your mail server to relay all email through your ISP's SMTP relays
  • You could configure your mail server to smarthost only email that's being blocked through your ISP's SMTP relays
  • Purchase a 3rd party SMTP relay service that you can use to relay your email