pop3ml is an open source and highly configurable PHP class that can be used to easily manage newsletters or mailing lists, without using a local SMTP server.
As its name suggests, pop3ml uses a POP3 account to manage the mailing lists. You will be able to simply subscribe or unsubscribe with an email message.
pop3ml features unsubscription/subscription confirmation, subscription moderation, digest message mode, message moderation, children/parent list management, mail filter (procmail-like syntax), mail scheduling to postpone a message, message queue for unsent emails, command to retrieve messages, message size check, bounce detection, black/white list, message header management, multi rcpt-to smtp command and much more.
· POP 3 client class
· SMTP E-Mail Sending Class
· PHP SASL
· MIME E-mail message parser