Recipients entered into the to field have an incorrect format

I am getting this error when sending to a distribution list I made
“recipients entered into the to field have an incorrect format”
I even made a test list with two of my own email addresses and the same error.
Any ideas how to fix this?

It means exactly what it says. All addresses need to be in the format of
There shouldn’t be any spaces in the address, nor should it end with a dot.

If you are still having issues, right-click on the distribution list and choose Save As. Send the vcf file to me directly on and I will have a look for you.

email sent, I appreciate the help.

It seems in the test list there is one address like abc@123,xyz
So there is a comma rather than at dot.

In the other, there is an address that ends in @gmail.comb