From few days now, our Magento 2.3.7 website cannot send emails for password reset. What I've tried is to send mail with PHP CLI mail command, that works like a char (php -r).
Adding logs into vendor/laminas/laminas-mail/src/Transport/Sendmail.php tell me that there is no error on mail function, it returns true. But in other way, I do not have any log into /var/log/mail.log file and I don't receive mail.
I've tried to telnet our SMTP server (same IP that is setup in back office), that works fine. I have success message on front after sending form.
Do you have an idea to debug this mess ? Thank you.
