把程序放到一个文件中，然后包含再call就可以了。(JMAIL4.3)

<%'警告函数
sub w_msg(message,w_to,w_link)
'message是你要弹出的警告信息，w_to=1表示自动后退一页，当w_to<>1时w_link表示要跳转的页面
if w_to="1" then
%>

<%else%>

<%end if
end sub%>
<%
sub sendmail(mailtitle,mailtext,mailaddress,mailcc,mailbcc,attachment,mailserver)
if mailtitle="" then
mailtitle="系统测试邮件"
end if
if mailtext="" then
mailtext="Just a test"
end if
if mailaddress="" then
call w_msg("邮件地址不能为空","1","")
end if
if mailserver="" then
mailserver="smtp.163.com"
end if
set msg=server.createobject("JMail.Message")
msg.silent = true
msg.logging = true
msg.Charset="GB2312"
msg.ContentType = "text/html"
msg.MailServerUserName="yourusername"
msg.MailServerPassword="yourpassword"
msg.From="youremail"
msg.FromName="dorryyang"
mailaddress_s=split(mailaddress,",")   ' 邮件地址用,格开
for i=0 to ubound(mailaddress_s)
msg.AddRecipient trim(mailaddress_s(i))
next
if mailcc<>"" then
mailcc_s=split(mailcc,",")
for i=0 to ubound(mailcc_s)
msg.AddRecipientCC trim(mailcc_s(i))
next
end if
if mailbcc<>"" then
mailbcc_s=split(mailbcc,",")
for i=0 to ubound(mailbcc_s)
msg.AddRecipientBCC trim(mailbcc_s(i))
next
end if
if attachment<>"" then
msg.AddAttachment(attachment)  'attachment写附件地址
end if
msg.Subject=mailtitle
msg.HTMLBody=mailtext
msg.Send(mailserver)
msg.close
set msg=nothing
call w_msg("发送成功","1","")
end sub
%>