diff --git a/HowtoDovecot.md b/HowtoDovecot.md
index a03ee683..b4394f1e 100644
--- a/HowtoDovecot.md
+++ b/HowtoDovecot.md
@@ -476,6 +476,49 @@ auth_debug = yes
 #auth_debug_passwords = yes
 ~~~
 
+### Se connecter en IMAP via telnet
+
+Pour debug des situations, on peux se connecter en IMAP cia telnet en local sur le port 143, voici quelques commandes utiles :
+
+~~~
+~# telnet 127.0.0.1 143
+Trying 127.0.0.1...
+Connected to 127.0.0.1.
+Escape character is '^]'.
+* OK [CAPABILITY IMAP4rev1 LITERAL+ SASL-IR LOGIN-REFERRALS ID ENABLE IDLE STARTTLS AUTH=PLAIN AUTH=LOGIN] Dovecot ready.
+~~~
+
+* Se connecter avec un utilisateur :
+
+~~~
+a1 LOGIN foo $PASSWORD
+a1 OK [CAPABILITY IMAP4rev1 LITERAL+ SASL-IR LOGIN-REFERRALS ID ENABLE IDLE SORT SORT=DISPLAY THREAD=REFERENCES THREAD=REFS THREAD=ORDEREDSUBJECT MULTIAPPEND URL-PARTIAL CATENATE UNSELECT CHILDREN NAMESPACE UIDPLUS LIST-EXTENDED I18NLEVEL=1 CONDSTORE QRESYNC ESEARCH ESORT SEARCHRES WITHIN CONTEXT=SEARCH LIST-STATUS BINARY MOVE SPECIAL-USE] Logged in
+~~~
+
+* Pour lister les repertoires :
+
+~~~
+a2 LIST """*"
+* LIST (\HasNoChildren \Sent) "." Sent
+* LIST (\HasNoChildren) "." Envoy&AOk-s
+* LIST (\HasNoChildren \Trash) "." Trash
+* LIST (\HasNoChildren \Drafts) "." Drafts
+a2 OK List completed (0.000 + 0.000 secs).
+~~~
+
+* Pour examiner le contenu d'un dossier :
+
+~~~
+a3 EXAMINE INBOX
+* FLAGS (\Answered \Flagged \Deleted \Seen \Draft)
+* OK [PERMANENTFLAGS ()] Read-only mailbox.
+* 263 EXISTS
+* 0 RECENT
+* OK [UNSEEN 2] First unseen.
+* OK [UIDVALIDITY 1571146202] UIDs valid
+* OK [UIDNEXT 278] Predicted next UID
+a3 OK [READ-ONLY] Examine completed (0.000 + 0.000 secs).
+~~~
 
 ## Optimisations