Hi,

since some days (about 10) I get the following error in mail error log many, many times:

... dovecot: imap(user@domain.com pid:32769 session:): Error: mmap() failed with file /home/dovecotindex/domain.com/user/mailboxes/Trash /dovecot.index.cache: Cannot allocate memory ....

It's always the same "dovecot.index.cache" file and only for the same heavily used account. The account is currently used from about 10 different clients with imap at the sime time.

I checked the size of the index cache file and it seems very big:

total 2,7G -rw------- 1 mailstore mailstore 464 Mär 24 14:36 dovecot.index -rw------- 1 mailstore mailstore 464 Mär 24 14:36 dovecot.index.backup -rw------- 1 mailstore mailstore 2,7G Mär 24 14:19 dovecot.index.cache -rw------- 1 mailstore mailstore 140 Mär 24 14:45 dovecot.index.log -rw------- 1 mailstore mailstore 89K Mär 24 14:36 dovecot.index.log.2

About 2,7 GB?

To solve the problem temporarily, I removed the index files from the index Trash folder and Dovecot initialized an index rebuild. Now the size of the index files are small:

total 28K -rw------- 1 mailstore mailstore 512 Mär 24 14:47 dovecot.index -rw------- 1 mailstore mailstore 20K Mär 24 15:28 dovecot.index.cache -rw------- 1 mailstore mailstore 1,2K Mär 24 15:28 dovecot.index.log

But why could the index cache file be so big?

Many thanks Urban