A.You should consider setting the IMAP4 clients up to use TCP port 25 to send e-mail.
B.You should consider setting up a new Send connector and set up it to use TCP port 110 to send e-mail.
C.You should consider setting the IMAP4 clients up to use TCP port 587 to send e-mail.
D.You should consider setting up a new Send connector and set up it to use TCP port 143 to send e-mail.