Mutt/Neomutt with Maildir do not save sent email

Since I changed from mbox to Maildir format, mutt/neomutt does not save sent email in ~/.muttrc I have

et mbox_type=Maildir
set folder="~/Maildir"    
set mask="!^\\.[^.]"
set mbox="~/Maildir"      
set spoolfile="~/Maildir"     
set postponed="+.Drafts"  # this I added after but nothing changed
set record="+.Sent"       # this I added after but nothing changed

the ~/Maildir tree

$ ls -R Maildir/
Maildir/:
cur  Draft  draftbox  new  outbox  Sent  sentbox  tmp  trash

Maildir/cur:
1737497891.V10307I5fbe8M146242.myhostname      1738400102.V10306Ic54e2M329900.myhostname:2,S
1737572852.V10307I5fbcaM212202.myhostname:2,S  1738779407.V10306Ic0d38M429367.myhostname:2,S
1737654476.V10307I5fb93M26824.myhostname       1739001859.V10306Ic55a1M270393.myhostname:2,S
1737718132.V10307I5fa87M173575.myhostname:2,S  1739210926.V10306Ic580cM502391.myhostname:2,S

Maildir/Draft:

Maildir/new:
1738155609.V10307Ic36a2M239995.myhostname  1738915125.V10306Ic2a87M548369.myhostname
1738264124.V10306Ic6fd5M305286.myhostname  1739089986.V10306Ic14bbM498891.myhostname
1738278926.V10306Ic0ccdM774234.myhostname  1739296548.V10306Ice92dM403450.myhostname
1738475978.V10306Ic1cefM416932.myhostname  1739360330.V10306Ic0e16M153268.myhostname
1738610292.V10306Ic1d23M237920.myhostname  1739465208.V10306Ic1905M306194.myhostname
1738697646.V10306Ic56abM101647.myhostname  1739466647.V10306Ica30cM369123.myhostname
1738864130.V10306Ic557eM199187.myhostname

Maildir/Sent:

Maildir/tmp:

If inside mutt/neomutt I try to open one of that *.myhostname file, mutt/neomutt says "~/Maildir/new/1739466647.V10306Ica30cM369123.myhostname is not a mailbox" Anyone has some advice ?