An organization recently switched from a cloud-based email solution to an in-house email server. The firewall
needs to be modified to allow for sending and receiving email. Which of the following ports should be open on
the firewall to allow for email traffic? (Choose three.)
Port 25 is used by Simple Mail Transfer Protocol (SMTP) for routing e-mail between mail servers.
Port 110 is used for Post Office Protocol v3 (POP3), which is an application-layer Internet standard protocol
used by local e-mail clients to retrieve e-mail from a remote server over a TCP/IP connection.
Port 143 is used by Internet Message Access Protocol (IMAP) for the management of email messages.