Index: openacs-4/packages/acs-mail-lite/tcl/email-inbound-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/acs-mail-lite/tcl/email-inbound-procs.tcl,v
diff -u -N -r1.15.2.2 -r1.15.2.3
--- openacs-4/packages/acs-mail-lite/tcl/email-inbound-procs.tcl	16 Jun 2019 11:40:00 -0000	1.15.2.2
+++ openacs-4/packages/acs-mail-lite/tcl/email-inbound-procs.tcl	16 Jun 2019 12:50:42 -0000	1.15.2.3
@@ -186,7 +186,9 @@
                     lpri_party_ids -
                     hpri_object_ids -
                     lpri_object_ids {
-                        set v_p [ad_var_type_check_integerlist_p $new(${spn})]
+                        # test, if list contains only integers
+                        set map [lmap x $new(${spn}) {if {[string is integer -strict $x]} continue; set x} ]
+                        set v_p [expr {$map eq ""}]
                     }
                     hpri_subject_glob -
                     lpri_subject_glob {
@@ -1287,7 +1289,7 @@
                 # method, such as a pre-signed unique-id in message
                 # content could be added as well.
                 # For now, we warn whenever this is used.
-                if { [ad_var_type_check_number_p $pot_object_id] } {
+                if { [string is integer -strict $pot_object_id] } {
                     if { [acs_object::object_p -id h_arr(aml_object_id)] } {
                         ns_log Warning "acs_mail_lite::inbound_queue_pull \
  Accepted insecure email object_id '${pot_object_id}' \
Index: openacs-4/packages/acs-mail-lite/tcl/legacy-inbound-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/acs-mail-lite/tcl/legacy-inbound-procs.tcl,v
diff -u -N -r1.2 -r1.2.2.1
--- openacs-4/packages/acs-mail-lite/tcl/legacy-inbound-procs.tcl	22 Jun 2018 15:48:55 -0000	1.2
+++ openacs-4/packages/acs-mail-lite/tcl/legacy-inbound-procs.tcl	16 Jun 2019 12:50:42 -0000	1.2.2.1
@@ -81,7 +81,7 @@
                 # Special treatment for e-mails which look like they contain an object_id
                 set pot_object_id [lindex [split $email(to) "@"] 0]
                 ns_log Debug "Object_id for mail:: $pot_object_id"
-                if {[ad_var_type_check_number_p $pot_object_id]} {
+                if {[string is integer -strict  $pot_object_id]} {
                     if {[acs_object::object_p -id $pot_object_id]} {
                         callback acs_mail_lite::incoming_object_email -array email -object_id $pot_object_id