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Kernel and Embedded Linux
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starttls, 8bitmime, verp, etrn, etrn -> 0xd1 -> 8BITMIME ETRN VERP STARTTLS foobar, auth, pipelining, size, vrfy -> 0x2e -> AUTH PIPELINING SIZE VRFY xclient, xforward -> 0x300 -> XCLIENT XFORWARD