To retry, or not to retry? That is the question.?

A member of one of my groups attempted to post by email but got this bounce back from yahoogroups.com:

> 4.7.1 [TS03] All messages from 82.165.159.130 will be permanently

> deferred; Retrying will NOT succeed. See

> http://postmaster.yahoo.com/421-ts03.html

The content of the page at postmaster.yahoo.com indicates that the email server at the cited IP address is effectively blacklisted from posting to Yahoo (Groups, or maybe both Groups and Mail). The IP address is for an email server at an email service, not the member's computer, so presumably the blacklisting could affect any Groups user with an address at that email service.

There's a cognitive dissonance in that message. It has a 4.7.1 reply code yet the text says "Retrying will NOT succeed". On the cited page there is a link to "best practices for senders" where it advises one to retry after a 4xx reply code because "This is a temporary error."

So... the advice is "Retry because it is a temporary error, but don't expect it to succeed because messages from that IP address will be permanently deferred."?

What advice do I give this member? Should he be bringing such bounces to the attention of his email service provider, or should he just retry the post and get on with life?