authentication issues with ipad / mac email client

[Rajesh M.]

hi

i am using dovecot version2.2.7 provided by qmailtoaster - 64 bit on centos 6.5 64 bit system - 16 gb ram with a hex core processor.

i was using qmail pop3 on a 32 bit system for the past over 7 years and had absolutely no issues.

with dovecot pop3 i have started receiving a variety of problems

mac machines and ipads -- port 110 does not work at all. i have to use port 995 only.

i have allowed plain text auth.

thunderbird works perfectly -- both imap and pop3 with port 110 and port 995

outlook 2010 also works but incase of one customer the mail download is very slow. i have a windows servers with mailenable mail server and the same customer could download perfectly from those windows servers.

i am using the default "service pop3" settings

Do i need to increase the memory settings /  for pop3 login similar to imap login which i am missing out like what is configured for imap. (pl see config file below)

My mail server is busy with around 4000 mailboxes and transacting over 200k emails per day. atleast around 250 simultaneous pop3 connections during peak hours.



# dovecot -a | grep pop3_uidl_format
pop3_uidl_format = %08Xu%08Xv


[root at ns1 spamassassin]# dovecot -n
# 2.2.7: /etc/dovecot/dovecot.conf
# OS: Linux 2.6.32-431.29.2.el6.x86_64 x86_64 CentOS release 6.5 (Final)
auth_cache_negative_ttl = 0
auth_cache_size = 32 M
auth_cache_ttl = 30 mins
auth_mechanisms = plain login digest-md5 cram-md5
default_login_user = vpopmail
disable_plaintext_auth = no
first_valid_gid = 89
first_valid_uid = 89
log_path = /var/log/dovecot.log
login_greeting = ready.
mail_max_userip_connections = 50
mail_plugins = " quota"
managesieve_notify_capability = mailto
managesieve_sieve_capability = fileinto reject envelope encoded-character vacation subaddress comparator-i;ascii-numeric relational regex imap4flags copy include variables body enotify environment mailbox date ihave
namespace {
  inbox = yes
  location =
  prefix =
  separator = .
  type = private
}
passdb {
  args = cache_key=%u webmail=127.0.0.1
  driver = vpopmail
}
plugin {
  quota = maildir:ignore=Trash
  quota_rule = ?:storage=0
}
protocols = imap pop3

service imap-login {
  client_limit = 256
  process_limit = 400
  process_min_avail = 4
  service_count = 0
  vsz_limit = 384 M
}
ssl_cert = </var/qmail/control/servercert.pem
ssl_dh_parameters_length = 2048
ssl_key = </var/qmail/control/servercert.pem
userdb {
  args = cache_key=%u quota_template=quota_rule=*:backend=%q
  driver = vpopmail
}
protocol imap {
  imap_client_workarounds = delay-newmail
  mail_plugins = " quota imap_quota"
}
protocol pop3 {
  pop3_client_workarounds = outlook-no-nuls oe-ns-eoh
  pop3_fast_size_lookups = yes
  pop3_lock_session = no
  pop3_no_flag_updates = yes
}


i am really puzzled because dovecot was highly recommended by all.

thanks for all your help


rajesh


----- Original Message -----
From: Daniel Parthey [mailto:pada at posteo.de]
To: 24x7server at 24x7server.net,dovecot at dovecot.org
Sent: Sat, 01 Nov 2014 09:34:53 +0100
Subject: Re: authentication issues with ipad / mac email client

Hi,

please post
* output of "doveconf -n"
* error log messages from dovecot for failed vs. succeeded login

Regards
Daniel