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Fix for large Mailboxes to avoid timeouts

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** I agree to the code of conduct and the contributory guidelines **

Tested with 80+GB single inbox via imap

``` --nofoldersizes --skipsize --fast ``` file and folder sizes are only used for statistics, which are completely useless. Before the actual data is transfered the message and folder sizes need to be calculated on a 200 000+ message inbox, this will almost never complete.

``` --buffersize 8192000 ``` sets the io buffer to 8mb, the default buffer is 4kbyte, this is speeds up syncs.

```  --skipheader 'X-*' ``` X headers vary wildly from system to system and do not ensure message uniqueness, they are not needed.

```  --split1 3000 --split2 3000 ```    split the requests in several parts on the server, 3000 is the number of messages handled per request.

``` --fastio1 --fastio2 ``` use fastio
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eXtremeSHOK 2018-02-14 13:27:30 +02:00 committed by GitHub
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commit a37a8e3b2a
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data/Dockerfiles/dovecot/imapsync_cron.pl
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@ -74,6 +74,14 @@ while ($row = $sth->fetchrow_arrayref()) {
"--timeout1", "10",
"--tmpdir", "/tmp",
"--subscribeall",
"--nofoldersizes",
"--skipsize",
"--buffersize 8192000",
"--skipheader 'X-*",
"--split1 3000",
"--split2 3000",
"--fastio1",
"--fastio2",
($exclude eq "" ? () : ("--exclude", $exclude)),
($subfolder2 eq "" ? () : ('--subfolder2', $subfolder2)),
($maxage eq "0" ? () : ('--maxage', $maxage)),