In addition to all the things discussed in this thread, please remember that neither email nor SMS are guaranteed to be instantaneous. SMTP in particular is still very much store-and-forward. The fact that the majority of e-mail appears to transmit so quickly is a function of a solid protocol design
Reposted from Mike Masnick
Heh. Had a doctor's appointment this morning, and just looked at my email and see this arrived... 55 minutes after my appointment. Great work everyone.

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