Redmine

Test covers this case.
source:tags/3.1.1/test/unit/mailer_test.rb#L607

We checked the DB entries. This is one issue I still get notifications from:

Mail from 29.04.16

25 issue(s) that are assigned to you are due in the next 7 days:
...
• Distribution - Testdevices #2940: 2 Testgeräte mit AL Lieferung August
...
View all issues
________________________________

{
    "table": "issues",
    "rows":
    [
        {
            "id": 2940,
            "tracker_id": 9,
            "project_id": 16,
            "subject": "2 Testgeräte mit AL Lieferung August",
            "description": "Hallo XX,
@ XX, kannst Du bitte 2 Geräte zu Ihm schicken lassen als Testgeräte, eines mit Zeittraum bis Ende Oktober, das andere bis Ende Dezember, Lieferung erst im August!",
            "due_date": "2015-07-31",
            "category_id": 71,
            "status_id": 5,
            "assigned_to_id": 4,
            "priority_id": 4,
            "fixed_version_id": null,
            "author_id": 2,
            "lock_version": 29,
            "created_on": "2014-07-08 13:30:19",
            "updated_on": "2016-03-09 12:15:39",
            "start_date": "2014-07-08",
            "done_ratio": 100,
            "estimated_hours": null,
            "parent_id": null,
            "root_id": 2940,
            "lft": 55,
            "rgt": 56,
            "is_private": 0,
            "closed_on": "2016-03-09 12:15:39" 
        }
    ]
}

{
    "table": "issue_categories",
    "rows":
    [
        {
            "id": 71,
            "project_id": 16,
            "name": "Leihstellung",
            "assigned_to_id": null
        }
    ]
}

{
    "table": "projects",
    "rows":
    [
        {
            "id": 16,
            "name": "Distribution",
            "description": "Distribution und Logistik Tasks/Workflows",
            "homepage": "",
            "is_public": 0,
            "parent_id": 14,
            "created_on": "2014-02-11 11:37:08",
            "updated_on": "2014-02-11 11:37:08",
            "identifier": "distribution",
            "status": 1,
            "lft": 12,
            "rgt": 13,
            "inherit_members": 0
        }
    ]
}

{
    "table": "trackers",
    "rows":
    [
        {
            "id": 9,
            "name": "Testdevices",
            "is_in_chlog": 0,
            "position": 7,
            "is_in_roadmap": 0,
            "fields_bits": 4,
            "default_status_id": 1
        }
    ]
}

{
    "table": "issue_statuses",
    "rows":
    [
        {
            "id": 5,
            "name": "Closed",
            "is_closed": 1,
            "position": 6,
            "default_done_ratio": null
        }
    ]
}

AFAK, the structure is originial. No modification from any plugin.