--- /dev/null
+http://marc.info/?l=mutt-dev&m=128045511126422
+
+Make "move to trash folder" use IMAP COPY.
+
+by Paul Miller (jettero)
+
+--- a/imap/imap.c
++++ b/imap/imap.c
+@@ -893,6 +893,12 @@ static int imap_make_msg_set (IMAP_DATA*
+ if (hdrs[n]->deleted != HEADER_DATA(hdrs[n])->deleted)
+ match = invert ^ hdrs[n]->deleted;
+ break;
++ case M_EXPIRED: /* imap_fast_trash version of M_DELETED */
++ if (hdrs[n]->purged)
++ break;
++ if (hdrs[n]->deleted != HEADER_DATA(hdrs[n])->deleted)
++ match = invert ^ hdrs[n]->deleted;
++ break;
+ case M_FLAG:
+ if (hdrs[n]->flagged != HEADER_DATA(hdrs[n])->flagged)
+ match = invert ^ hdrs[n]->flagged;
+@@ -2028,3 +2034,54 @@ int imap_complete(char* dest, size_t dle
+
+ return -1;
+ }
++
++int imap_fast_trash() {
++
++ if( Context->magic == M_IMAP && mx_is_imap(TrashPath) ) {
++ IMAP_MBOX mx;
++ IMAP_DATA *idata = (IMAP_DATA *) Context->data;
++ char mbox[LONG_STRING];
++ char mmbox[LONG_STRING];
++ int rc;
++ dprint(1, (debugfile, "[itf] trashcan seems to be on imap.\n"));
++
++ if ( imap_parse_path(TrashPath, &mx) == 0 ) {
++ if( mutt_account_match(&(idata->conn->account), &(mx.account)) ) {
++ dprint(1, (debugfile, "[itf] trashcan seems to be on the same account.\n"));
++
++ imap_fix_path (idata, mx.mbox, mbox, sizeof (mbox));
++ if (!*mbox)
++ strfcpy (mbox, "INBOX", sizeof (mbox));
++ imap_munge_mbox_name (mmbox, sizeof (mmbox), mbox);
++
++ rc = imap_exec_msgset (idata, "UID COPY", mmbox, M_EXPIRED, 0, 0);
++ if (!rc) {
++ dprint (1, (debugfile, "imap_copy_messages: No messages del-tagged\n"));
++ rc = -1;
++ goto old_way;
++
++ } else if (rc < 0) {
++ dprint (1, (debugfile, "could not queue copy\n"));
++ goto old_way;
++
++ } else {
++ mutt_message (_("Copying %d messages to %s..."), rc, mbox);
++ return 0;
++ }
++
++ } else {
++ dprint(1, (debugfile, "[itf] trashcan seems to be on a different account.\n"));
++ }
++
++ old_way:
++ FREE (&mx.mbox); /* we probably only need to free this when the parse works */
++
++ } else {
++ dprint(1, (debugfile, "[itf] failed to parse TrashPath.\n" ));
++ }
++
++ dprint(1, (debugfile, "[itf] giving up and trying old fasioned way.\n" ));
++ }
++
++ return 1;
++}
+--- a/imap/imap.h
++++ b/imap/imap.h
+@@ -72,4 +72,7 @@ void imap_keepalive (void);
+
+ int imap_account_match (const ACCOUNT* a1, const ACCOUNT* a2);
+
++/* trash */
++int imap_fast_trash();
++
+ #endif
+--- a/mx.c
++++ b/mx.c
+@@ -802,6 +802,11 @@ static int trash_append (CONTEXT *ctx)
+ && stc.st_dev == st.st_dev && stc.st_rdev == st.st_rdev)
+ return 0; /* we are in the trash folder: simple sync */
+
++ #ifdef USE_IMAP
++ if( !imap_fast_trash() )
++ return 0;
++ #endif
++
+ if ((ctx_trash = mx_open_mailbox (TrashPath, M_APPEND, NULL)) != NULL)
+ {
+ for (i = 0 ; i < ctx->msgcount ; i++)