Hello i have installed zimbra network edition and now i have strange problem:
sometimes when i receive mail with attachment in html i have this mail error in outlook:

Local failure notice

This e-mail was generated for technical support purposes.

Sync Type: Delta Sync

Sync Token (before request): 3904

Sync Token (most current): 3905

Store: Zimbra - Silvia Povelato

Computer Name: PC_SILVIA

ZCO Version:

Server Version: 7.1.1_GA_3213

Error IDs:
id (1280) type(message)
id (1302) type(message)

this is a problem for my farmer because i don't see the mail in outlook but only by webmail.

thanks for help!