Migrated from end-of-life Zimbra 8.5x after it really started slowing down (requiring restarts of MySQL or entire Zimbra stack multiple times a day) with a ~100GB single mailbox. Once I moved MX records to my new new Carbonio CE, it actually had no problem. Which makes me think the 50 or so milters may have really been the issue, since I get well into five figures of email messages a day. I have archived my old mail and am now uploading all that email into a separate archive account on a multi-domain Carbonio CE instance. A few tens of millions of messages to go after several days. Anyone explore a single mailbox that size before, with Carbonio CE? Is it the mail filters that seem to be the limiting factor as wth EOL Zimbra or something else? Thank you 😀