Michael R. Hines-5 wrote:
> 
> Tomas,
> 
> Thank you for responding! After disabling all the plugins (and composing 
> a new email), the problem remains.
> 
Standard SquirrelMail does not have anything related to Sender-ID. If you
use standard unmodified SquirrelMail scripts, then you have some proxy
between SquirrelMail and real SMTP server. This proxy inserts Sender-ID
headers and violates SMTP protocol. SMTP server thinks that email header is
SMTP command. Check your SMTP server or show all changes made in
SquirrelMail scripts.

-- 
Tomas
-- 
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