Not all message Headers downloaded?

I was looking for an old message and found it on my server, it is from 2012, so five years ago. When i was trying to look for that message in my local emClient, i found out that it only downloaded the message headers up to 2013. Is there a setting that limits either the time or the number of message headers downloaded? I dont want to use the archive feature, i just would like to have ALL message headers available in the inbox…

Ok seems to be not a emClient but a Dovecot Mail Server Problem.