/* -M[x]: various operations on the following list of message ids:
-M deliver the messages, ignoring next retry times and thawing
-Mc deliver the messages, checking next retry times, no thawing
/* -M[x]: various operations on the following list of message ids:
-M deliver the messages, ignoring next retry times and thawing
-Mc deliver the messages, checking next retry times, no thawing