Dear All, I am using Koha 22.05.06.000 I was trying to share Koha Lists created on OPAC using the "Share list" Option. The following URL is used: https://myServer/cgi-bin/koha/opac-shareshelf.pl?op=invite&shelfnumber=13 And email send failure is reported in the "message_queue" table with "failure_code" as SENDMAIL Then I tried the using the "Send List" Option The following URL is used: https://eakl.neduet.edu.pk/cgi-bin/koha/opac-sendshelf.pl?shelfid=13 And email is sent successfully. First of all I would like to know what are the requirements of "Share list" option so that I do not get the SENDMAIL failure. I want to use this option as it allows me to customize the "SHARE_INVITE" and "ACCEPT_INVITE" notice. Also I have not been able to find any information about this option in the manual https://koha-community.org/manual//22.05/en/html/lists.html#viewing-lists . The "Share List" option is not shown there. Secondly, if the option is no longer available, how can I customize the message being sent in the email using the "Send List" Option. Thank you very much for your time. With best regards, Naveen Ali ITM-JE (EAKL) Inst Representative for HEC Digital Library Resources. NEDUET, Karachi.