[Tickets #14001] Linked attachments don't work as expected

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Ticket URL: https://bugs.horde.org/ticket/14001
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  Ticket             | 14001
  Created By         | benedetto.vassallo at unipa.it
  Summary            | Linked attachments don't work as expected
  Queue              | IMP
  Version            | 6.2.8
  Type               | Bug
  State              | Unconfirmed
  Priority           | 3. High
  Milestone          |
  Patch              |
  Owners             |
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benedetto.vassallo at unipa.it (2015-06-01 08:14) wrote:

When I try to send a single attached file bigger than 5 MB, it works as
expected.
When I try to send, say 3 files of 2 MB each, the response is "Error when
communicating with the server" and the mail is not sent.

In my log I see the following message:

2015-02-27T11:17:06+01:00 EMERG: HORDE [imp] Call to a member function
setRaw() on a non-object [pid 29524 on line 2909 of
"/var/www/horde5/imp/lib/Compose.php"]
2015-02-27T11:17:06+01:00 DEBUG: HORDE 1.
Horde_ErrorHandler::catchFatalError()

If I click again the "Send" button, I got an error
like "unable to create vfs file .horde/imp/compose/xxxxxxx".
In fact the file is created in the vfs storage.
My vfs storage type is file, and the base directory is owned by
apache:apache and have 750 permissions.
My Linux distro is CentOS Linux release 7.1.1503 (Core)
My apache version is httpd-2.4.6-31.el7.centos.x86_64
My php version is 5.5.25

My imp configuration is:
$conf['compose']['use_vfs'] = true;
$conf['compose']['link_attachments_notify'] = false;
$conf['compose']['link_attach_threshold'] = 5242880;
$conf['compose']['link_attach_size_hard'] = 5242880;
$conf['compose']['link_attach_size_limit'] = 104857600;
$conf['compose']['link_attachments'] = true;
$conf['compose']['attach_size_limit'] = 0;
$conf['compose']['attach_count_limit'] = 0;