GeoNetwork - UserFeedbackAPI - newUserFeedback: Missing settings in System Configuration

[fvanderbiest]

When submitting a comment + evaluation on a metadata, right after composition spin up:

docker-geonetwork-1                         | 2023-11-13T09:01:15,235 ERROR [geonetwork.api] - UserFeedbackAPI - newUserFeedback: Missing settings in System Configuration (see Administration menu) - cannot send mail
docker-geonetwork-1                         | java.lang.IllegalArgumentException: Missing settings in System Configuration (see Administration menu) - cannot send mail
docker-geonetwork-1                         | 	at org.fao.geonet.util.MailUtil.configureBasics(MailUtil.java:353) ~[gn-core-4.2.2-georchestra.jar:?]
docker-geonetwork-1                         | 	at org.fao.geonet.util.MailUtil.configureBasics(MailUtil.java:436) ~[gn-core-4.2.2-georchestra.jar:?]
docker-geonetwork-1                         | 	at org.fao.geonet.util.MailUtil.sendMail(MailUtil.java:104) ~[gn-core-4.2.2-georchestra.jar:?]
docker-geonetwork-1                         | 	at org.fao.geonet.api.userfeedback.UserFeedbackAPI.newUserFeedback(UserFeedbackAPI.java:517) ~[gn-services-4.2.2-georchestra.jar:?]
docker-geonetwork-1                         | 	at org.fao.geonet.api.userfeedback.UserFeedbackAPI$$FastClassBySpringCGLIB$$7897453e.invoke(<generated>) ~[gn-services-4.2.2-georchestra.jar:?]