Im looking for a quick way to send the same email out to over 500 email addresses. What is the best way to do this and what format would I need the email addresses in, (I currently have them in a spreadsheet). Thanks
You can use the mail function of PHP. Alternatively you can use phpMailer from sourceforge, if you want to use SMTP to send your mails.
Yep, either in some database or text file. Then you will have to send the emails in a loop to every address.
Not necessary. There are scripts that allows you to parse spreadsheets. Use it to get the email ids and then use the mail function or phpMailer.
the best way to send an email message to a list is to use your regular email client, such as Outlook, Gmail, Hotmail, or other and send your email like you would any other email. Just address it to the list address as you would any other email that you send. In other words, you would send an email to "your-list-name@lists.onenw.org" There is an option to send email through the Sympa web interface but it has limited capabilities so I strongly recommend sending email through your regular email client.