Add Readme file for handling delete-list-member error.

README.error.delete-list-member

@@ -0,0 +1,45 @@
+# ----------
+# Error 'Sympa::List::delete_list_member'
+# ----------
+
+May 28 17:40:05 lists sympa_msg[2882143]: info Sympa::List::delete_list_member() Unable to remove list member hannah.kon93@gmail.com from list Sympa::List <ssv-ko@lists.lsvrlp.de>: Not on list
+May 28 17:40:05 lists sympa_msg[2882143]: err main::#243 > Sympa::Spindle::spin#95 > Sympa::Spindle::DoCommand::_twist#120 > Sympa::Spindle::spin#95 > Sympa::Request::Handler::signoff::_twist#74 > Sympa::List::delete_list_member#1621 > Sympa::Database::commit#439 DIED: bug in logic. Ask developer at /usr/local/sympa-6.2.68/bin/Sympa/Database.pm line 439.
+
+# Error descrition
+#
+# When Sympa receive an unsubscribe command in the subject of an email, it causes 
+# the service to crash. The unsubscribe request is held in the spool directory but 
+# the member is successfully unsubscribed from the list, despite an error in the 
+# log to the contrary. Other requests continue to be received but held until the 
+# unsubscribe request is removed from the spool and Sympa services are restarted.
+
+
+# Solution:
+#
+# delete the unsubscribe request from spool directory
+#
+
+
+# --------------------
+#
+# 1. search unsubscribe request at directory '/usr/local/sympa/spool/msg'
+#
+#    # cd /usr/local/sympa/spool/msg 
+#    # grep -i -l -E 'grep -i -l -E 'Subject:\s+unsubscribe\s+<LIST-NAME>' *
+#
+# 2. Delete unsubscribe message
+#
+# 3. Delete all files located in directory /usr/local/sympa/spool/tmp
+#
+# --------------------
+
+
+# Example
+
+lists.mx:~ # cd /usr/local/sympa/spool/msg
+lists.mx:~ # grep -i -l -E 'subject:\s+unsubscribe\s+ssv-ko@lists.lsvrlp.de' *
+sympa@lists.lsvrlp.de.1653727895.2804933
+lists.mx:~ # rm sympa@lists.lsvrlp.de.1653727895.2804933
+
+lists.mx:~ # rm -f /usr/local/sympa/spool/tmp/*
+