authentication issues with ipad / mac email client

[Rajesh M.]

hi

we are using using qmail toaster with dovecot pop3 and imap client

outlook and thunderbird works fine

in case of several  ipad / mac email clients
imap works fine but pop3 logins are not working with 110 port

my dovecot config file is given below

could somebody help please



# Settings for 'stock' qmail-toaster

disable_plaintext_auth = no
default_login_user = vpopmail
mail_max_userip_connections = 50

service imap-login {
  service_count = 0
  client_limit = 256
  process_min_avail = 4
  vsz_limit = 384M
  process_limit = 400
}


auth_cache_size = 32M
auth_cache_ttl = 1800
auth_cache_negative_ttl = 0
auth_mechanisms = plain login digest-md5 cram-md5
auth_username_format = %Lu

first_valid_uid = 89
first_valid_gid = 89
log_path = /var/log/dovecot.log

login_greeting = ready.

mail_plugins = $mail_plugins quota
plugin/quota = maildir
protocols = imap pop3
ssl_cert = </var/qmail/control/servercert.pem
ssl_key = </var/qmail/control/servercert.pem
# the following will likely be the default at some point
ssl_dh_parameters_length = 2048


namespace {
  inbox = yes
  location =
  prefix =


# prefix = INBOX.
# Use 'prefix = INBOX.' for Courier-IMAP compatible transparent migration.
# This forces all client apps to create subfolders underneath/within
# the inbox instead of adjacent to it. It's not necessary to be that way.
# FWIW, shubes thinks this setting is annoying/rediculous/retarded.
# As a practical example, having no prefix allows mobile users to select
# which folders get synchronized. Otherwise their whole mailbox is
# synchronized, and they have no way to choose which folders they want sync'd.
  separator = .
  type = private
}

passdb {
  args = cache_key=%u webmail=127.0.0.1
  driver = vpopmail
}

protocol imap {
  imap_client_workarounds = "delay-newmail"
  mail_plugins = $mail_plugins imap_quota
}

protocol pop3 {
  pop3_client_workarounds = outlook-no-nuls oe-ns-eoh
  pop3_fast_size_lookups = yes
  pop3_lock_session = no
# pop3_uidl_format = UID%u-%v
pop3_no_flag_updates=yes
}

userdb {
  args = cache_key=%u quota_template=quota_rule=*:backend=%q
  driver = vpopmail
}

plugin {
  quota = maildir:ignore=Trash
  quota_rule = ?:storage=0

}


thank you very much,
rajesh