Networks

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However making a guess The Organization in question has added G Mail to their Black List most likely because they get a lot of Spam or other junk from E Mail Accounts that are not from an ISP but a General Cloud Account.

So in answer to your question Did the lawyer do it on purpose? Yes they did but not to you personally but from everyone who attempts to contact them from any G Mail Account.

Now for a fuller explanation

"Google tried to deliver your message, but it was rejected by the recipient domain.

The receiving end doesn't accept E Mail from G Mail Accounts and most likely all Cloud Mail Providers because no Proof of the person is required to open one of these Accounts and hence they are unreliable.

We recommend contacting the other email provider for further information about the cause of this error.

This means that you need to contact the Receiver and tell them that your E Mail type is on their Black List and ask them how they want you to contact them in the future.

The error that the other server returned was: 553 553-5.7.1 sorry, that domain isn't in my list of allowed rcpthosts

I would have thought that this was self explanatory it clearly says that domain isn't in my list of allowed rcpthosts That means that your E Mail Account belongs to a Domain most likely G Mail as you said Google that is not accepted by the receiver.

553-5.7.1 hm let me see ...
553-5.7.1 hm does it look good ?
553-5.7.1 No! You are a bad guy!
553 5.7.1 sorry, that domain isn't in my list of allowed rcpthosts (state 14)."

Something to do with the person who setup the Mail Filter to the actual Mail Filter. These could be either a Default Message for all Black Listed Domains Cloud E Mail Providers or they could be some clowns idea of being cleaver. Either is possible but they really sound like some Programmers Idea of being Funny so I would say they originate from the Program that is being used.

Col

Maybe because the domain does not exist. Maybe because something isn't configured correctly.
What I would do is https://encrypted.google.com/search?q=553+5.7.1

"The strange comments at the end could be related to the content of my note."

No. It has nothing to do with content. Your IP or domain may be on a blacklist at the receiving mx. The comments aren't really all that strange.