[Koha] Problem Sharing Lists on Koha

[Ms. Naveen Ali]

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.