The MTA logs can be viewed on the “Mail transfer agent log” page. Some keywords, like for example an email address, are color coded.
Only the last two MTA log files will be shown. If older logs should be viewed, export the logs (see Log export) or view the logs on the command line.
Specific log items can be filtered using the “Filter”. Matched results will be highlighted.
If enabled, the filter is treated as a regular expression.