个人认为,e-mail就是electrici mail,既然mail有复数形式,email同样有.
查字典结论如下：
e-mail or e·mail also E-mail (ē'māl') Pronunciation Key
n.
A system for sending and receiving messages electronically over a computer network,as between personal computers.
A message or messages sent or received by such a system.
tr.v.e-mailed or e·mailed also E-mailed,e-mail·ing or e·mail·ing also E-mail·ing,e-mails or e·mails also E-mails
所以,email有复数形式.