I'm running FMS on the new macmini M1 in Big Sur (which I will point out is simply remarkable compared to my old xeon 12 core. Many high resource functions are 40-80% faster)
However the new Base Elements plugin with native support for the M1 has a bug in BE_SMTPsend. You cannot send to more than one email at a time now - and this broke a bunch of important scripts in my system.
Adding more than one email to either to: cc: or bcc: yields error 55. I took me a whole day to find that this was the problem.
Assigning to a variable ($email = "email1@xx.xom, email2@xxxx.com) or just hardcoding in the command itself both give error 55 and fail.
Just a heads up.
my only solution is to loop though email address and send one at a time (or 3 at a time by using To: CC: and Bcc:)