Could not instantiate mail function. (ultimate v4.18.3)

Hi
I installed ssmtp in ubuntu
/etc/sbin/sendmail → ssmtp*

ssmtp.conf:
root=emreg@br****.com
mailhub:587=smtppro.zoho.com
UseSTARTTLS=YES
AuthUser=emreg@br****.com
AuthPass=******** (zohomail app password)
rewriteDomain=br****.com
hostname=br****.com
FromLineOverride=YES

echo "Subject:Test " | ssmtp -v -f “emreg@br***.com” emregover9@****.com
works fine.

Cscart setting / general /email:
php mail function
host: smtppro.zoho.com:587
user: emreg@br***.com
pass: ********
SMTP Auth: TLS checked
path: /usr/sbin/sendmail

TLS is passed, but not SSL…

Updating admin info gives this error:
“Could not instantiate mail function”

Before setting cscart email, after ssmtp installation, I received a vendor application form-email from a fake bot. :slight_smile:

The php mail function requires set up mail server software to be installed on the server. Otherwise you need to switch to SMTP.