SMTPCommand stores a set of constants for SMTP command codes. To interpret
the meaning of the codes, familiarity with RFC 821 is assumed.
The mnemonic constant names are transcriptions from the code descriptions
of RFC 821. For those who think in terms of the actual SMTP commands,
a set of constants such as {@link #HELO HELO } are provided
where the constant name is the same as the SMTP command.
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