A patron’s Koha account had a address within its primary email address field and all patron messaging preferences were enabled (including the “Digests only” preferences), and yet, after a time, Koha failed to send notices to the patron’s email address. It was confirmed when checking the “Notices sent for [patron name] ([patron barcode])” tab on the patron’s account that Koha stopped sending notices to the patron’s email address. The email addresses of another patron account with the same patron messaging preference within this Koha system received notices from Koha. Koha began re-sending notices to the patron email address when the “Item checkout” patron messaging preference was disabled and then re-enabled. This is on Koha 3.22.08
Hi Christopher, I am sorry, but 3.22 is end of life and doesn't receive any bug fixes or updates any more. It's hard to tell what might have gone wrong there, so not sure how to test this in newer versions. If you find there is still a problem in 17.05 upwards, please reopen.