Hurricanes such as Katrina, power blackouts, earthquakes, floods, ice storms are a possible causes of long-term disruptions in e-mail service. Non-natural threats may include terrorist attacks and bomb scares.
Vimbunga kama vile Katrina, kukatika kwa umeme, matetemeko, mafuriko, barafu dhoruba ni sababu ya uwezekano wa kukatika muda mrefu katika huduma ya barua pepe. vitisho yasiyo ya asili ni pamoja na mashambulizi ya kigaidi na bomu kukutisha.