I have agreed to do a once off email blast for a children's health charity. They have been given the list by a government department and all the members of that list are employees of that department. There are about 15000 in all. There is no offer - simply a one-time informational email regarding a specific area of children's health directly relevant to the employees in question.
I have signed up for two different mailing companies on their behalf only to have the list refused as a "third party list" in both cases.
Can anyone point me in the direction of a company that would take this on at a fairly reasonable cost?