My client the New York Post is getting this intermittent bounce code I've never seen before from optimum.net:
550 5.7.1 Unacceptable Sender address @be6.maropost.com from host 162.247.112.102 : denied - 01 What does that mean? I'm trying abuse@ & postmaster@ the mailbox provider, but are there any better channels to reach them? Tim Starr Senior Director - Deliverability Maropost.com
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