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The meaning of the Acronym 550 is...
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HTTP Error Codes
550
550 is
Mailbox Unavailable
550 is also in:
HTTP Error Codes
Acronym Definition Searched:
NMMP
99586
VABF
PRTC
PL
LENS
MIL
42082
FFAT
HFH
BUZ
FLP
URF
Nimexe
91387