I agree and if memory serves Dovecot uses a default setting for max connections if no setting is in the conf file.  I can't remember the number, but it's low, 10 or 20.
On 01/21/2014 06:51 AM, Eric Shubert wrote:
Sounds like a dovecot setting to me.

Vivek, are you seeing any error messages in the dovecot.log file?

Try adding this to your dovecot local.conf file (just to see if it makes any difference for you):
protocol imap {
  imap_client_workarounds = "delay-newmail"
  # Maximum number of IMAP connections allowed for a user from each IP address.
  # NOTE: The username is compared case-sensitively.
  mail_max_userip_connections = 20
}


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