mail box rebuild disk space
El Cap, Current.
My virus SW (ClamAV) deleted an infected file from an email. I can't delete what remains. Clam said rebuild mailbox. Does not solve problem.
I've rebuilt the mailbox twice now and my available disk space has gone from 215GB to 198GB. I think the mail file has grown. I still can't delete the file.
Rebuild process gives basically no feedback on progress. I looked at Utility Monitor and after a while there did not seem to be any serious CPU effort. To me, that means it was done doing what it was doing.
I feel robbed.
I have another computer with most of the same email. For 20Gb I'd accepted the minor losses if I could move that mail to this computer (2015 map). Other computer, iMac is same OS and vintage.
I saw some other remedies, or attempted remedies in the Yosemite area. It involved terminal and did not lead to a clear solution. I have scanned this computer and do not have viruses. I practice normal care with emails.
I have back ups before this problem, but wouldn't know how to restore just the mail, and at this point I would lose valuable email if I lose say the last 5 days.
So here's my question. It's not too complicated. How do I get out of this mess and be happy?