Zimbra Release 5.0.20 problem sending mail with attacched file

[alessio]

Hi All,
I have a BIG problem
from yesterday a Zimbra server that worked perfectly for one year stop sending mail with attached file.... above 3MB only 2MB work
Already check max file size (10240KB) and so on..

# zmcontrol -v
Release 5.0.20_GA_3127.RHEL5_20091102114907 CentOS5 FOSS edition

in mailboxlog we have this error message:

smtp - Exception occurred during SendMsg: com.zimbra.cs.mailbox.MailSender$SafeSendFailedExc eption
.....

SoapEngine
- handler exception
com.zimbra.cs.mailbox.MailServiceException: SMTP server reported: null
................

Thanks in Advanced for any Help :-)

[phoenix]

The file size may be greater than you have set in your Admin UI (it depends on the encoding), see this article and increase the size and see if the message gets sent.

[alessio]

The file size may be greater than you have set in your Admin UI (it depends on the encoding), see this article and increase the size and see if the message gets sent.

Thank you for your answer.
I know that the global file size dependes of encoding.
We set Maximum message size (kb): 20000

in main.cf:message_size_limit = 20480000

As said befor until 2 days ago all works as charm...

[soxfan]

The error message you are getting seems to me to indicate something other than a size issue. Are you sure it isn't the type of file you are trying to attach as opposed to the size?

[phoenix]

What's the whole of the error you're receiving in maillog?

[alessio]

What's the whole of the error you're receiving in maillog?

Opsss...
Solved.
Mailarchiva is the problem
in my main.cf:
smtpd_milters = inet:10.13.10.116:8092

removed this line all works fine... te problem now is how to fix mailarchiva ;-)
thanks