Hi! Apologies if this has come up before, or if this is a duplicate posting (I tried posting before but I think it got lost). Anyways, I'm trying to set up an IMAP server with dovecot, and everything seems to be more or less working except that I periodically see error messages like this in my logs:

Feb 18 01:01:15 stark dovecot: lmtp(31956, root@aleme.nu): Error: link(/var/decrypted/vmail/aleme.nu/root/mailboxes/INBOX/dbox-Mails/dovecot.index, /var/decrypted/vmail/aleme.nu/root/mailboxes/INBOX/dbox-Mails/dovecot.index.backup.tmp) failed: Operation not permitted

I'm assuming it's a permissions problem with my maildir, but I can't figure out what the relevant process is in order to fix it. The maildir is owned by vmail with permissions set to 700; here is the output of dovecot -n:

2.1.7: /etc/dovecot/dovecot.conf

OS: Linux 3.2.0-4-amd64 x86_64 Debian 7.8 fuse.encfs

mail_gid = vmail mail_location = mdbox:/var/decrypted/vmail/%d/%n mail_uid = vmail 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 { 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 { args = /etc/dovecot/dovecot-sql.conf.ext driver = sql } plugin { antispam_allow_append_to_spam = no antispam_dspam_args = --user;root;deliver=;--source=error;--client antispam_spam = Junk antispam_trash = Trash sieve = ~/.dovecot.sieve sieve_before = /var/lib/dovecot/sieve/before sieve_dir = ~/sieve sieve_global_dir = /var/lib/dovecot/sieve/global } protocols = " imap lmtp sieve" service auth { unix_listener /var/spool/postfix/private/auth { group = postfix mode = 0660 user = postfix } } service imap-login { inet_listener imaps { port = 993 ssl = yes } service_count = 1 } service lmtp { unix_listener /var/spool/postfix/private/dovecot-lmtp { group = postfix mode = 0600 user = postfix } user = vmail } ... <ssl stuff> ... userdb { args = uid=vmail gid=vmail home=/var/vmail/%d/%n driver = static } protocol lmtp { mail_plugins = " sieve" } protocol imap { mail_plugins = " antispam" }

As you can see, I'm keeping the maildir on an encfs-encrypted volume, in case that's relevant. Please let me know any ideas for why this might be happening. Thanks in advance!

Emanuel