[cpx] Mail forward from CPX Webmail don't work

["Iris Denko" <tecnoteam@xxxxxxxxxxx>]

On all of my accounts except one the end user can login in in CPX and in 
Webmail part of CPX create Mail forward wiith two options:

Forward email to the following email address(es):
Save a copy of forwarded mail on the server.

On all of my accounts except this one works fine. I have the same 
configuration for the users on all of my accounts. All users are added via 
CPX and all have an entry in virtusertable such as:

username@xxxxxxxxxxxxxx     username

It is standard CPX configuration and nothing is customized.

On this one, my latest ordered VPS2 end july, Mail forward don't work and I 
see in maillog this error message:

Nov  9 13:13:14 top117 sendmail[46018]: kA9CDAVJ046018: to=me@xxxxxxxxxxxx, 
ctladdr=site14 (1034/1034), delay=00:00:04, xdelay=00:00:01, mailer=relay, 
pri=30005, relay=localhost.. [127.0.0.1], dsn=5.6.0, stat=Data format error

on other accounts works fine and in maillog I see:

Nov  9 13:12:41 top111 sm-mta[17029]: kA9CCc98016996: to=<me@xxxxxxxxxxxx>, 
ctladdr=<username@xxxxxxxxxxxxxx> (1084/1000), delay=00:00:03, 
xdelay=00:00:01, mailer=esmtp, pri=30324, relay=mydomain.com. 
[213.198.31.115], dsn=2.0.0, stat=Sent (kA9CCeGV016155 Message accepted for 
delivery)

But this is difference by "ctladdr=" entry.

On working accounts is ctladdr=<username@xxxxxxxxxxxxxx> with properly 
addedd domaon of user (not host domain)

On non working account is only ctladdr=site14 without any domain or brackets 
as on all other accounts. And this wrong entry caused "stat=Data format 
error".

But why is so different on this account? I checked all config files and 
found no difference between.

And now the best. I contacted ViaVerio Support and after many days he told 
me I need to add in virtusertable file username@xxxxxxxxxxxxxx (not 
userdomain.com) to works but on my question why this on other accounts works 
fine and why CPX add username@xxxxxxxxxxxxxx and not username@xxxxxxxxxxxxxx 
as he stated I received still yet no answer.
I'm over 9 years Reseller and I hear something for first time. I used Mail 
forward on old VPS1 with .forward file without any problems and I configure 
my accounts all on the same way.
Have any analogous experience or any idea where I need to search? Any help 
would be appreciated.

Best regards,
Iris

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