[Tickets #7897] unable to set sender to [my at mail]

[bugs at horde.org]

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Ticket URL: http://bugs.horde.org/ticket/7897
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  Ticket             | 7897
  Created By         | savage at htmb.com
  Summary            | unable to set sender to [my at mail]
  Queue              | IMP
  Version            | 4.1.6
  Type               | Bug
  State              | Unconfirmed
  Priority           | 2. Medium
  Milestone          |
  Patch              |
  Owners             |
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savage at htmb.com (2009-01-27 05:06) wrote:

Hello,
 From a little time i've serious problems with my Horde IMP H3 (4.1.6)  
version of my webmail.
Before was all ok, but now when i try to send a msg i receive this  
error "unable to set sender to [my at mail]."
I dont know how i can find ant fix the error because this is the  
unique messages that i have.
Maybe it's possible the configuration of the antispam and the change  
of the listenings ports or what?

I have problems only on webmail, if i use my mails with a client (ex.  
outlook) works without problems.

I use plesk 9.0 (updated from 8.6 but before i had the same error)  
with windows 2003 SE server.

Sorry for my english and thanks in advance for any help you can give me.

Daniele.