Every so often recently I've seen the load on my heavily under-used dovecot server (1 mailbox) rise up to 1

A top shows imap-login to causing the issue.

I have checked /var/log/secure, /var/log/maillog, /var/log/messages and cannot see anything unusual.

Anybody else seen something like this?

# 2.2.5: /etc/dovecot/dovecot.conf # OS: Linux 2.6.32-358.14.1.el6.x86_64 x86_64 CentOS release 6.4 (Final) listen = * mail_location = maildir:~/.Maildir 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 mbox_write_locks = fcntl namespace inbox { inbox = yes location = mailbox Drafts { special_use = \Drafts } mailbox Junk { special_use = \Junk } mailbox Sent { special_use = \Sent } mailbox "Sent Messages" { special_use = \Sent } mailbox Trash { special_use = \Trash } prefix = } passdb { driver = pam } plugin { sieve = ~/.dovecot.sieve sieve_dir = ~/.sieve } protocols = imap service imap { process_limit = 2048 } ssl_cert = </etc/pki/dovecot/certs/imap.crt ssl_key = </etc/pki/dovecot/private/imap.key userdb { driver = passwd } protocol lmtp { mail_plugins = sieve $mail_plugins } protocol lda { mail_plugins = sieve } protocol imap { mail_max_userip_connections = 50 }

-- Regards,

Giles Coochey, CCNP, CCNA, CCNAS NetSecSpec Ltd +44 (0) 8444 780677 +44 (0) 7983 877438 http://www.coochey.net http://www.netsecspec.co.uk giles@coochey.net