Email help

Can anyone advise?

I have a client for whom I've set up a database-based email system. The database is Access, it creates a 'to' list of targetted contacts and sends emails using (spit) Outlook. Client is now complaining that she can't use Outlook to send emails when she's not logged into her usual ISP: all pretty standard (though not helped by her being in Uganda).

Question, then, is:
Can you suggest a solution for mass emailing, using a contact list created on an ad-hoc basis by a query within the Access database, that would permit Client to send emails regardless of how / where she's logged on?

Any solution would have to be free, and pretty low-maintenance.

EDIT: I have no access to the PC (in fact, a laptop) or the user, except via very intermittent email. She is PC-illiterate. And I am not so good at all this pinging and SMTP, either. (Didn't know that you could get around the ISP-reliant sending thing, for example.)

Thanks in advance!

No pain, no gain

Went to yoga despite feeling very wrung-out.

Bad because: my feet turned blue

Good because: had lovely flood of ideas and notions while doing relaxation poses: nothing earth-shattering,
but worth some exploration.

Moral of Story: paint toenails a colour that will not clash with purplish tinge of circulatory / cramp-related problems.