remote | local blocks in protocol settings

[Christian Kivalo]

>> Webmail probably just quickly opens and closes the connections, so 
>> there aren't any connections that are visible for more than a fraction 
>> of a second.
> 
> On the real issue: I am trying to identify why (just recently) webmail
> users recently are increasingly facing the error: "ERROR : Connection
> dropped by imap-server".
> 
> The docs I've read on webmail (squirrelmail) affirm your indication
> that webmail IMAP connections should be closing quickly, so these
> should not be the cause of the errors.
> 
> A few days ago, when I increased the global value of
> "mail_max_userip_connections", I stopped seeing errors "Maximum number
> of connections from user+IP exceeded" in dovecot log. However, the
> above problem continues in webmail.

Don't know if that helps but you could try a local imapproxy like 
imapproxy from imappproxy.org this should speed up your webmail and 
reuse connections

> Using the command "doveadm who" I see relatively few connections, so I
> am wondering what may be the cause.
> 
> Any ideas will be appreciated!
> 
> Thanks,
> Nick
Christian