Yahoo and their mail filters..

Carl Ford at
Thu Feb 26 19:35:57 CST 2009

very old news.

their filter restrictions have some very absurd rules

On Tue, Feb 24, 2009 at 9:27 PM, Micheal Patterson <
micheal at> wrote:

> This may be old news, but I've not been in the list for quite some time. At
> any rate, is anyone else having issues with Yahoo blocking / deferring
> legitimate emails?
> My situation is that I host our corporate mx'ers on my network, one of the
> companies that we recently purchased has Yahoo hosting their domains mail.
> Mail traffic to them is getting temporarily deferred with the "421 4.7.0
> [TS01] Messages from temporarily deferred due to user
> complaints -;
> see"
> The admin of the facility has contacted Yahoo about this but their response
> was for "more information" when they were told that traffic from my mx to
> their domain was to being deferred.  I may end up just having them migrate
> to my systems just to maintain company communications if we can't clear this
> up in a timely manner.
> --
> Micheal Patterson

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