Wirelessly posted (Mozilla/5.0 (SymbianOS/9.1; U; en-us) AppleWebKit/413 (KHTML, like Gecko) Safari/413 UP.Link/6.3.0.0.0)
While not familiar with that service, if they use the messaging app, check the settings in the messaging app, under email. Mine goes off for 2 min after getting new mail.
this works for all the e62 mail clients i've used (imap, xpressmail, goodlink, blackberry connect, intellisync, and nokia biz center).