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  2. List of SMTP server return codes - Wikipedia

    en.wikipedia.org/wiki/List_of_SMTP_server_return...

    551 User not local; please try <forward-path> 552 Requested mail action aborted: exceeded storage allocation 553 Requested action not taken: mailbox name not allowed 554 Transaction has failed (Or, in the case of a connection-opening response, "No SMTP service here") 554 5.3.4 Message too big for system [4] 556 Domain does not accept mail [5]

  3. COVID-19 pandemic - Wikipedia

    en.wikipedia.org/wiki/COVID-19_pandemic

    The standard method of testing for presence of SARS-CoV-2 is a nucleic acid test, [115] which detects the presence of viral RNA fragments. [116] As these tests detect RNA but not infectious virus, its "ability to determine duration of infectivity of patients is limited". [ 117 ]