To configure an e-mail client you will need the following information. FOR POP3 PROTOCOL Server Type: POP3 Incoming Server: pop.1and1.com (port 110) Outgoing Server: smtp.1and1.com (port 25 or 587) Account name/Username: Mailbox number (m12345678-0) or Email address Password: Your E-mail Password FOR IMAP PROTOCOL Server Type: IMAP Incoming Server: imap.1and1.com (port 143) Outgoing Server: smtp.1and1.com (port 25 or 587) Account name/Username: Mailbox number (m12345678-0) or Email address Password: Your E-mail Password Note: Outgoing server needs to be authenticated with username and password.  You can also use the outgoing mail server from your Internet service provider (your DSL or cable Internet).