I wrote a flow to compile e-mail addresses from a List, appending the e-mail addresses taken from the List into a String variable (only if the List item meets a certain criteria). The flow loops until it has checked every item on the List. Subsequently the String variable is sent by Outlook to myself so I will receive a compiled list of the e-mail addresses that were appended.

The problem is that when there are simply too many e-mail addresses to append, the String variable seems to run out of capacity. Example: I am expecting 70 e-mail addresses to be appended and sent to me, but currently seems to be capped at only 58 e-mail addresses.
Is there a better way to do this? ...I am currently thinking of creating an Integer variable to keep count whenever an append is made, then send the Outlook to myself when the limit count is reached, say 40 or 50, before it hits the string's capacity of 58 e-mail addresses.