I worked around it by having Nagios send email to a separate gmail account (and sync that on my phone), and had gmail forward it to @pcs. That way the text alerts me, and I can then read the email in the mail client. Reading email via their gateway is pretty bad, but it functions as an alerting mechanism which is all I personally really need it for.
Still pretty hacky though, it'd be nice if they brought the @sms one back.
(It'd also be nice if the forum software didn't delete @sms every time I edit the message...)