Error message with 6,463,488 files size
msg: Message exceeded allowed size
data: [object Object]
trace: com.zimbra.cs.mailbox.MailServiceException: Message exceeded allowed size Code:mail.MESSAGE_TOO_BIG Arg:(maxSize, NUM, "10240000") at com.zi...
After settings changed to 15728640 (15MB)
It worked. I can live with that. I'll experiment and see what it takes to send an actual 10MB file. That is as big as SMTP should have to deal with. After all it's "E-mail" and not "E-Common Carrier". :-)
I wouldn't ask the postal service to deliver a refrigerator.