'Connection reset by peer'

[Jos v. d. O. <jo...@va...>]

Hi,

I'm trying to push to an IMAP server and the connection is reset by peer. I'm 
wondering if this can be avoided. The configuration is added below and the 
redacted output of running with -D is attached.

Cheers,
Jos

```
$ mbsync -D --config mbsyncrc --push --full MAIL
new message 1213 on slave
  -> pair(-2,1213) exists
  -> pushing message, TUID fFzb1tNbHJO+
synchronizing flags
propagating new messages
>>> 5 APPEND "INBOX" (\Seen \Deleted) "30-Jun-2016 08:40:53 +0200" {8355}
+ send literal data
(1 in progress) >>> 6 APPEND "INBOX" (\Deleted) "30-Jun-2016 08:40:53 +0200" 
{9806}
Socket error from _____._______.nl (__.___.___.___:993): Connection reset by 
peer
```

`mbsyncrc`
```
IMAPAccount MAIL
Host _____._______.nl
User user
Pass pass
Port 993
SSLType IMAPS 
AuthMechs * 

IMAPStore MAIL-remote 
Account MAIL
  
MaildirStore MAIL-local
Path ~/imap/MAIL/
Inbox ~/imap/MAIL/Inbox
Trash ~/imap/MAIL/Trash
  
Channel MAIL
Master :MAIL-remote:
Slave :MAIL-local:
Patterns *
Patterns % !Trash
Create Both
ExpireUnread no
CopyArrivalDate yes
```