You must provide a valid account to smtp servet (account and password)
I'm not sure blabla@gmail.com really exists

I put a valid one in my projeqtor.
I've just changed to blabla@gmail.com for the forum.

I put a valid one in my projeqtor.
I've just changed to blabla@gmail.com for the forum.
 

That(s not what the SMTP server says 

2024-02-14 12:59:05.020 ** ERROR ** [V11.1.3] PHPMail error : SMTP connect() failed.

email and password are totally ok.
I tried again with new installation of ProjeQtOr 11.1.4.

I have this error log:2024-02-23 20:30:58.831 ** ERROR ** [V11.1.4] Error sending mail
2024-02-23 20:30:58.832 ** ERROR ** [V11.1.4] SMTP Server : smtp.gmail.com
2024-02-23 20:30:58.833 ** ERROR ** [V11.1.4] SMTP Port : 465
2024-02-23 20:30:58.834 ** ERROR ** [V11.1.4] Mail stored in Database : #18
2024-02-23 20:30:58.835 ** ERROR ** [V11.1.4] PHPMail error : SMTP connect() failed. https://github.com/PHPMailer/PHPMailer/wiki/Troubleshooting
2024-02-23 20:30:58.835 ** ERROR ** [V11.1.4] PHPMail debug :

perhaps because of that:

Since 2022, Gmail stopped third party applications from using username and password authentication, hence the error you are getting.

I think that Gmail gives option to activate the remote login with user / password.
You must configure it on your gmail application.

thank you a lot.
It's working now by setting correctly my google security parameter.
https://support.google.com/mail/answer/185833?hl=fr&sjid=15150553584601647093-EU