Plesk sbin mailmng-outgoing utility applies changes in UI
Currently, the changes made with plesk sbin mailmng-outgoing utility don't change the information inside of the Plesk UI.
It'll be useful to add such a feature, so the changes that were made with mailmng-outgoing utility will be shown inside of the Plesk UI, e.g. if the command plesk sbin mailmng-outgoing --set-mailname-limits --domain-name=example.com --mailname=test --out-limit=250 was executed, then inside of the Plesk>Tools&Settings>Outgoing Mail Control>Domains> example.com the 250 value was displayed.
It's more of a bug than a feature request. Please create a detailed bug report here: https://talk.plesk.com/forums/reports.746/
I will forward it to the developers for further research and fixes.