Sent messages not show full list

[Taker]

I have a "weird" situation, all sent file are getting deleted it only shows messages sent from the past month but messages sent before that are not show...
I went to the configuration but I didn't see anything regarding deleting messages before one month old..
So is this a roundcube thing or it has to do with the server?
I can't access email sent past one month old...

[SKaero]

That would be something the mail server is doing.