I've always thought the term "post-punk" is as disingenuous as the term "post-modern" considering that both punk and modern continual to exist, we are not beyond or after them. In the most literal sense, "post-punk" can be a term to describe the influence of music after the advent of punk music, but it seems to me the term (like all artistic terms from baroque and gothic to rock and roll and punk these originated as criticisms) was a criticism insinuating a decline or end of authentic punk. That is not true. Punk is not dead. New wave and grunge sure may have died, but punk most certainly is alive and well.
Exhibit A
Subhumans Cradle to the Grave 1983
Exhibit B
Civil Disobedience "In a Few Hours of Madness EP 1993
Exhibit C
A Global Threat Out In the Dark" 2002
Exhibit D
underground crust bands well into the future 2012
Exhibit E
and look who just came out with an album last year, Defiance Out of Order 2011