Add config to disable it

config.yml.sample

@@ -39,6 +39,9 @@ service:
   # each request made to this endpoint neefs to provide an `Authorization: <token>` header with the token from below. <br/>
   # **You should never use this unless you know exactly what you're doing**
   testingtoken: ''
+  # If enabled, vikunja will send an email to everyone who is either assigned to a task or created it when a task reminder
+  # is due.
+  enableemailreminders: true
 
 database:
   # Database type to use. Supported types are mysql, postgres and sqlite.

docs/content/doc/setup/config.md

@@ -170,6 +170,13 @@ each request made to this endpoint neefs to provide an `Authorization: <token>`
 
 Default: `<empty>`
 
+### enableemailreminders
+
+If enabled, vikunja will send an email to everyone who is either assigned to a task or created it when a task reminder
+is due.
+
+Default: `true`
+
 ---
 
 ## database

pkg/config/config.go

@@ -52,6 +52,7 @@ const (
 	ServiceEnableTotp            Key = `service.enabletotp`
 	ServiceSentryDsn             Key = `service.sentrydsn`
 	ServiceTestingtoken          Key = `service.testingtoken`
+	ServiceEnableEmailReminders  Key = `service.enableemailreminders`
 
 	AuthLocalEnabled      Key = `auth.local.enabled`
 	AuthOpenIDEnabled     Key = `auth.openid.enabled`
@@ -233,6 +234,7 @@ func InitDefaultConfig() {
 	ServiceTimeZone.setDefault("GMT")
 	ServiceEnableTaskComments.setDefault(true)
 	ServiceEnableTotp.setDefault(true)
+	ServiceEnableEmailReminders.setDefault(false)
 
 	// Auth
 	AuthLocalEnabled.setDefault(true)

pkg/models/task_reminder.go

@@ -87,6 +87,10 @@ func getTaskUsersForTasks(taskIDs []int64) (taskUsers []*taskUser, err error) {
 // RegisterReminderCron registers a cron function which runs every minute to check if any reminders are due the
 // next minute to send emails.
 func RegisterReminderCron() {
+	if !config.ServiceEnableEmailReminders.GetBool() {
+		return
+	}
+
 	if !config.MailerEnabled.GetBool() {
 		log.Info("Mailer is disabled, not sending reminders per mail")
 		return
@@ -140,7 +144,6 @@ func RegisterReminderCron() {
 			mail.SendMailWithTemplate(u.User.Email, `Reminder for "`+u.Task.Title+`"`, "reminder-email", data)
 			log.Debugf("[Task Reminder Cron] Sent reminder email for task %d to user %d", u.Task.ID, u.User.ID)
 		}
-
 	})
 	if err != nil {
 		log.Fatalf("Could not register reminder cron: %s", err)