Proofpoint Blocking Ups Clients

I host MIAB (Mail in a box) on DO (Digital Ocean)

Received an email from someone sharing this hosting service saying that he cannot email any UPS addresses with the following error:

<xxxx@ups.com>: host mxa-002b8001.gslb.pphosted.com[x.x.x.x] refused to talk to me: 554 Blocked - see https://ipcheck.proofpoint.com/?ip=x.x.x.x

Does UPS feel that it is acceptable to lose customers because of this?

This is not an isolated incident as I found out from a quick online search. These are customers that are being blocked is this behavior even legal?

4 comments

[ 0.24 ms ] story [ 21.4 ms ] thread

stop50 2y ago ↗

Probably. This probably is part of their checks against spam. The rules they apply are random at best.some want technical solutions, others want an valid postal address on the domain that can be read by anyone.

peter_retief 2y ago ↗

I suspect they are blocking whole IP ranges?

What is interesting for me is that a company like UPS that is so customer focused would risk reputational damage by using an incompetent vendor.

stop50 2y ago ↗

You could ask the postmaster with an different email for this error

peter_retief 2y ago ↗

Good idea thanks. Hopefully UPS will put a fire under them so not to lose business.