Label,Meaning,Reference AUTHINFO,Authentication,[RFC4643] COMPRESS,Supported compression algorithms,[RFC8054] HDR,Batched header retrieval,[RFC3977] IHAVE,IHAVE command available,[RFC3977] IMPLEMENTATION,Server implementation-specific information,[RFC3977] LIST,LIST command variants,[RFC3977][RFC6048] MODE-READER,"Mode-switching server and MODE READER command available",[RFC3977] NEWNEWS,NEWNEWS command available,[RFC3977] OVER,Overview support,[RFC3977] POST,POST command available,[RFC3977] READER,Reader commands available,[RFC3977] SASL,Supported SASL mechanisms,[RFC4643] STARTTLS,Transport layer security,[RFC4642][RFC8143] STREAMING,Streaming feeds,[RFC4644] VERSION,Supported NNTP versions,[RFC3977]