We need to collect email addresses and store in a database for newletter mailings. I suggested a simple web-based form that will allow the site admin to enter the text, hit submit and then I will have the code use PHP's mail() function to send out the mailings.
I have heard that this might not be good approach when the list of recipients exceeds ~ 300. Best case for us in the distant future would be thousands.
Any thoughts or alternative solutions ?