incoming replies not detected

[McPizza0]

in our mailhandler, we check if there is a in-reply-to header
use this to check if the convo exists in the db, and add a new entry to existing convo

BUT
some services provide an array if email IDs
"in-reply-to": "<lalalala@rp.zero.e.uninbox.com> <lalalala@zendesk.com>"

we need to handle this and check all messages in the array till we fine a match