I have a list of 50K+ (double optin list-no spam issue) to which I need to send emails weekly or may be biweekly. I am looking for some advice to go for which VPS server? I will need to send these emails within 1-2 days only whenever I need to. I would be using the interspire script for mailing (any better?). So, what would be the typical RAM I would need? I contacted hostgator and they suggested me to go with level 5 VPS (1824 MB Ram). Can anybody give me heads up if its ok to go with hostgator and with level 5 (up or down level needed?). Also, what steps are needed to ensure maximum inbox delivery and no MTA blocking. Do I need to use PowerMTA to rotate smtp/IP/domain etc.? I am new to this PMTA thing, so please let me know how many IPs/domains/smtp needed to send 50k+ emails in 2 days. Thanks for any help.