Changing the "from" Email address when sending messages
I have my personal Gmail account. I am the Membership Chair of a national organization, and need to send Email reminders to members when it's time to renew their membership. I'd like the Emails to come from my organization address (also a Gmail account) rather than my personal address. I don't know how to make this change. I figure I need to send my message from the SMTP server, not my "E-mail client" - but I can't figure out how to make the appropriate changes.
(I successfully found the members who's membership expired 9/1 and had not renewed; and I successfully sent each one an Email message. However, the messages "came from" my personal account, and I'd rather avoid that in the future.)
I am using a MacBook Pro, OS 10.6.8.
Thank you for helping!!