Redmine

I am using redmine with receiving email to an inbox.
When I send email to my helpdesk for redmine, the one coming from example hotmail, gmail (web), and so on all works fine.
If I send from my Iphone or from my mail client (Lotus notes example) or IOS mail client or other clients, the email comes in but no attachements and I can't see owner-email.
No errors reports on rake.
If I check my helpdesk account I see that the ones that doesn't come in to redmine with attachment goes into mailbox failure, the ones coming from hotmail and gmail (web) all goes in correctly to accept box.

System Ubuntu 14.04 64bits
Environment:
Redmine version 2.6.3.stable
Ruby version 1.9.3-p484 (2013-11-22) [x86_64-linux]
Rails version 3.2.21
Environment production
Database adapter Mysql2
SCM:
Subversion 1.8.8
Git 1.9.1
Filesystem
Redmine plugins:
clipboard_image_paste 1.10
redmine_add_to_calendar 0.0.2
redmine_checklists 3.1.1
redmine_contacts 3.4.5
redmine_email_fetcher 0.3.1
redmine_email_images 0.1.1
redmine_helpdesk 0.0.12
redmine_ics_export 3.0.1.dev
redmine_idonethis 0.1
redmine_nu_mobile_viewer 1.1.0
redmine_silencer 0.4.0
redmine_tweaks 0.5.1
sidebar 0.1.2