Email forwarders doesn't work

My clients doesn't have email accounts on their hosting, only forwarders that forward tree emails to one gmail account. (We made it like this because they had problems with overflowed inboxes.

THey only have forwarders (not email accounts on server) to one gmail account. But few days before it was stop to work.
I tried this command

to get real time monitor and if I try to send some email to one of their emails (that must forward to gmail) I got this result:

I'm not sure what this means. Is there some error or not?

If we try to send emails to some email on alticom.hr (domain of my client) he does not get them forwarded to gmail. But direct sending to gmail works without problem.

 

Haven't tried.

 

Here is output

Code:

root@luka [~]# exigrep namehere@gmail.com /var/log/exim_mainlog
2013-07-04 23:22:52 1UuqzM-0000r3-Dk H=mail-oa0-f52.google.com [209.85.xx.xx]:56062 Warning: Message has been scanned: no virus or other harmful content was found
2013-07-04 23:22:52 1UuqzM-0000r3-Dk <= namehere@gmail.com H=mail-oa0-f52.google.com [209.85.xx.xx]:56062 P=esmtps X=TLSv1:RC4-SHA:128 S=1752 id=CAHOXY1178EKLDZCbaxC7vNTQDewq_Kt0m5yJ8vOdkG6F8tWhYw@mail.gmail.com T="test najnoviji" for namehere@domain.hr
2013-07-04 23:22:52 1UuqzM-0000r3-Dk check_mail_permissions could not determine the sender domain [routed_domain=gmail.com message_exim_id=1UuqzM-0000r3-Dk sender_host_address=209.85.xx.xx recipients_count=1]
2013-07-04 23:22:52 1UuqzM-0000r3-Dk ** namehere@gmail.com <namehere@domain.hr> R=lookuphost T=remote_smtp: retry time not reached for any host after a long failure period
2013-07-04 23:22:52 1UuqzM-0000r3-Dk Completed

+++ 1UuqzM-0000rF-LZ has not completed +++
2013-07-04 23:22:52 1UuqzM-0000rF-LZ <= <> R=1UuqzM-0000r3-Dk U=mailnull P=local S=2665 T="Mail delivery failed: returning message to sender" for namehere@gmail.com
2013-07-04 23:22:52 1UuqzM-0000rF-LZ ** namehere@gmail.com R=dkim_lookuphost T=dkim_remote_smtp: retry time not reached for any host after a long failure period
2013-07-04 23:22:52 1UuqzM-0000rF-LZ Frozen (delivery error message)