If what appears to be a QWKnet addressed was passed, but the QWK-ID portion was
exactly 9 characters, a 1-byte stack corruption would occur as the 10-char
local variable (node) could be written with 11 chars (9-char QWK-ID, colon,
null). The reported issue happend when attempting to send netmail to
"hemo@ujointbbs" which is neither a valid Internet email address or a valid
QWKnet address.