[LinaLauneBaer]

all-inkl has huge incompetencies when it comes to mail. Their servers end up on spam lists every 1-3 weeks. Effect: Your customers do not receive any more emails from you.

In addition if you inbox becomes larger than a specific size (1 GB is think) they will autoarchive your whole inbox to a folder... not nice if you have smart mail mailboxes

[Sprint]

I have never had either happen. I use a local mail client though and have it set to delete mails at their end after 14 days.