Revised 17 June -  There was a major system outage last weekend at our service providers and mail to selected mail ISPs continues to be blocked or ignore at random.

We have a number of discussions with our provider and are concerned that a number of ISPs keep blocking us, we complain and then get un blocked and then re-blocked only a week later.

We beleive that we are conforming to out provider's AUP [Acceptable Use Policy] and that seeing the outgoing e-mail IP [i.e. computer network] address is shared by our providers other customers we deduce that material from one or another of them must be contributing the the mail blocking problem.  We do not believe that the content of SEN should be generating undue visibility with a mail provider such as ATT/SBC or even Comcast.

To this end we are further working with out provider to improve the situation. The reason for moving to an outside provider was to get around these issues. This provider blocks or cancels our sending too frequently for thier opertional reasons. If we are not able to resolve the situation we will need to change providers again.