Unable to send email using Horde / Roundcube / mail client on Plesk server: Error connecting to SMTP server – Plesk Help Center

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Unable to send emails via Horde / Roundcube mail client. The following error message appears:

PLESK_INFO: Warning: There was an error sending your message: Error connecting to SMTP server.
The following error message appears when mail is sent in Roundcube / mail software:

PLESK_INFO: SMTP Error (-1): Connection to server failed
In Horde log /var/log/psa-horde/psa-horde.log, the following error can be found:

CONFIG_TEXT: ERR: HORDE [imp] Error connecting to SMTP server. [111] Connection refused [pid 6716 on line 1160 of "/usr/share/psa-horde/imp/lib/Compose.php"]
Postfix is used as mail service and it is in stopped status:
# service postfix status
Redirecting to /bin/systemctl status postfix.service
● postfix.service - Postfix Mail Transport Agent
Loaded: loaded (/usr/lib/systemd/system/postfix.service; enabled; vendor preset: disabled)
Active: inactive (dead)
server-hostname systemd[1]: Failed to start Postfix Mail Transport Agent.
server-hostname systemd[1]: Unit postfix.service entered failed state.
server-hostname systemd[1]: postfix.service failed.

SMTP Server Postfix is not running and thus cannot process mails.

Connect to the server via SSH.
Execute the following command to start the SMTP Server (Postfix) service:
# service postfix start

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