I just moved to my first dedicated server (yay me!) Anyways, now that I'm not sharing with others, I don't want to kill the server like I used to. I run a decent sized vBulletin site (7500+ members), and I send out monthly newsletters that are at least 10k in size. This has always been tough on the server. I've been using the built-in vB mailing program, but there obviously have to be other alternatives that are both easier on the server, and also allow me to send attachments (thinking of doing newsletters in the future either in html or pdf). Any recommendations of mailing programs to use?