I am planning to send a letter to about 100,000 of my users. Is there anything I need to know? How many emails should I send per second? Do I need to use SMTP authentication? What do I need to know to get past spam filters?
Are you on shared hosting server or you have your own dedicated server? Also it is advisable to use SMTP authentication to send emails. Kailash
I am on a dedicated server with 12GB of ram... I asked the admins about SMTP authentication and they had no clue what it was! They also said that I shouldn't send over 400 letters a day or hosts like gmail, yahoo etc will blacklist me, and that I need to pay to get whitelisted....