Another change for Bill:
Added (back) the '-d' command-line option to disable the deletion of processed (e.g. imported) inbound netmail messages. - This option has no effect if DeleteNetmail is set to "false" in sbbsecho.ini. - This option *only* disables deletion of incoming netmail (no effect on outbound netmail deletion) - In SBBSecho v2, the '-d' option disabled all netmail deletion, even though the help output only mentioned "netmail after import" (it was wrong).