- Plesk for Linux
An image from the signature is not displayed on recipient side. Image from the signature is not sent.
Bug PPPM-6635 that is planned to be fixed in future product updates.
As a workaround, login to the server via SSH and add the following lines into
# cat /etc/psa-webmail/horde/horde/php.ini
allow_url_fopen = On
allow_url_include = Off