Hi --
We are seeing some odd behavior with emails delivered to recipient
mailboxes protected by Carrierzone (https://carrierzone.com/).
Emails leaving our platform have a proper From header. However, when they
are received by Carrierzone, both the From and Return-Path headers have had
the domain
Hi
On Thu, May 27, 2021 at 02:33:10PM -0500, Chris Adams via mailop wrote:
> Emails leaving our platform have a proper From header. However, when they
> are received by Carrierzone, both the From and Return-Path headers have had
> the domain replaced with "sparkpostmail.com". It's almost as if