Error 535 on Dolibarr 18.0.2

I updated the version of my Dolibarr to 18.0.2 from 16.0.3; now it happens that I can no longer send emails, I use SMTP, sending tests also fails. I noticed that in the database the password is encrypted, whereas before it was readable, could this be the problem? Has this already happened to anyone in the community?

Thanks for the attention