proxy server

I have a bulk emailing list to a select group (I never spam, only to those who want it). Sometimes their imap/pop servers block my mail. I know I can assign another smtp over-riding what is in the php.ini file. I can likely find enough code here: http://ca3.php.net/manual/en/ref.mail.php So, where can I find another smtp server that will send my mail (using php) and certify that it comes from me? Is a proxy server the way to go? Costly? John || -- John Taylor-Johnston ----------------------------------------------------------------------------- "If it's not Open Source, it's Murphy's Law." ''' Cégep de Sherbrooke: ô¿ô http://www.cegepsherbrooke.qc.ca/languesmodernes/ - 819-569-2064 °v° Bibliography of Comparative Studies in Canadian, Québec and Foreign Literatures /(_)\ Université de Sherbrooke ^ ^ http://compcanlit.ca/ T: 819.569.2064