Based upon the very technical nature of this problem, I would suggest bypassing the entire problem and
have them get a free Gmail account and post from there ... just like you ;-)

On 11/28/2011 08:51, David Phillips wrote:
> mail.ourserver.tld gave this error:
> <email-2010.dsl.edu>: Helo command rejected: 551
> AUTO_DYNAMIC_IP_PATTERN_DSL2 551 Your mail server appears to use a
> Dynamic IP address. 551 Contact an admin or use our website for help.
>
> I am not literate enough in mail service jargon to know what that
> means, or how to help our subscriber.

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