Recently - possibly with an eM Client update - messages that I try to send are automatically place in my Local Folders Outbox (see attached pic) and can only be Sent by clicking Refresh. This also happens on my laptop which also has eM Client installed. I have uninstalled and reinstalled eM Client on both PCs with same results. Have tried suggestions in forum, but have not been successful.
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J’ai le même problème et je pensais trouver ici une solution.
Les messages envoyés sont stockés dans le dossier Boîte d’envoi des Dossiers locaux et ne sont pas envoyés.
Je remonte le sujet au cas où…
UP !!
If the messages are not being sent, there may be something interfering with the connection.
As a test, can you completely disable any anti-virus, firewall, proxy or VPN, then try send again. Sometimes even restarting your router may resolve this.
I finally found here :
https://forum.emclient.com/t/problems-when-sending-emails-via-smtp-with-outlook-com-accounts/87939
It seems that Microsoft changed OAuth login for the SMTP protocol.
Thanks for Reply 
