You can find this section in HostBill Admin → Settings → General Settings → Mail → Outgoing mail configuration
Send Emails
Define if you want to send out system emails or if you want to block system from sending any emails. If the feature is disabled - it overrides all other settings.
Email address for system emails
Choose which email address will be used as a sender (in 'From' field in your emails).
Mailer type
Choose the type of email client.
- PHP mail assumes your server is already preconfigured to send emails with base PHP functions.
- SMTP - type of email client that allows you to set-up connection with your email account.
SMTP Email Address
Enter your email address.
SMTP Hostname / Port
This is used for SMTP connection. If you need to connect using specific protocol, prefix your hostname with it, eg. ssl://smtp.example.com, tls://smtp.example.com
SMTP Username / Pasword
Used for SMTP connection - access details for that email account.
Limit mails per cron run
Set maximum number of email notifications HostBill should send per one cron run.