Try correcting auto reminder JSON

templates/email/referees/invite_contributor_to_referee_reminder1.json

 {
     "subject": "SciPost: refereeing request reminder",
     "recipient_list": [
-        // "referee.user.email"
 	"jscaux@scipost.org"
+        // "referee.user.email"
     ],
     "bcc": [
-        // "submission.editor_in_charge.user.email",
         "edadmin@scipost.org"
+        // "submission.editor_in_charge.user.email",
     ],
     "from_name": "SciPost Refereeing",
     "from_email": "refereeing@scipost.org"

templates/email/referees/invite_contributor_to_referee_reminder2.json

 {
     "subject": "SciPost: refereeing request",
     "recipient_list": [
-        // "referee.user.email"
 	"jscaux@scipost.org"
+        // "referee.user.email"
     ],
     "bcc": [
-        // "submission.editor_in_charge.user.email",
         "edadmin@scipost.org"
+        // "submission.editor_in_charge.user.email",
     ],
     "from_name": "SciPost Refereeing",
     "from_email": "refereeing@scipost.org"

templates/email/referees/invite_unregistered_to_referee_reminder1.json

 {
     "subject": "SciPost: refereeing and registration invitation reminder",
     "recipient_list": [
-        // "email_address"
 	"jscaux@scipost.org"
+        // "email_address"
     ],
     "bcc": [
-        // "invited_by.email",
         "edadmin@scipost.org"
+        // "invited_by.email",
     ],
     "from_name": "SciPost Refereeing",
     "from_email": "refereeing@scipost.org"

templates/email/referees/invite_unregistered_to_referee_reminder2.json

 {
     "subject": "SciPost: refereeing and registration invitation reminder",
     "recipient_list": [
-        // "email_address"
 	"jscaux@scipost.org"
+        // "email_address"
     ],
     "bcc": [
-        // "invited_by.email",
         "edadmin@scipost.org"
+        // "invited_by.email",
     ],
     "from_name": "SciPost Refereeing",
     "from_email": "refereeing@scipost.org"

templates/email/referees/remind_referee_deadline_1week.json

 {
     "subject": "SciPost: refereeing deadline approaching",
     "recipient_list": [
-        // "referee.user.email"
 	"jscaux@scipost.org"
+        // "referee.user.email"
     ],
     "bcc": [
-        // "submission.editor_in_charge.user.email",
         "edadmin@scipost.org"
+        // "submission.editor_in_charge.user.email",
     ],
     "from_name": "SciPost Refereeing",
     "from_email": "refereeing@scipost.org"