Koha can send email messages to your serial vendors if you have late issues. To the left of the main serials page there is a link to 'Claims'
The links to claims also appears to the left of the subscription detail page
If you don't have a claim notice defined yet you will see a warning message that you need to first define a notice.
Clicking 'Claims' will open a report that will ask you to choose from your various serial vendors to generate claims for late issues.
From the list of late issues you can choose which ones you want to send a claim email to by clicking the checkbox to the left of late issue, choosing the notice template to use and clicking the 'Send notification' button.