Zimbra unable to email from mobile after upgrade to 8.0.3 -

We recently upgraded our Zimbabo FOSS email server to version 8.0.3, and when all cell phones (Android and iPhone) are upgraded, the error recipient "email@domain.com" was rejected by the server It was given because it does not allow relaying. '

I can not find anything that looks has changed. Does anyone know that this is a known issue with Version 8.0.3?

Thank you for any help with this issue ... I am not making any difference, or even finding anything that really relates to it ... < / P>

edit

  as an update: I got the following information in my Zimbra.log ... Mar 26 16:58:21 Server Postfix / smtpd [22783]: NOQUEUE: Disclaimer: RCPT from: 29.sub-174-237-227.myvzw.com [174.237.227.2 9]: 554 5.7.1 Service Unavailable; Client host [174.237.227.29] blocked using zen.spamhaus.org; Http://www.spamhaus.org/query/bl?ip=174.237.227.29; Me@server.net> = & Lt; To do = & lt; Me@server.net> Proto = ESMTP Hello = & lt; [10.246.232.147] & gt; After researching the above edits, we came to know that the problem (apparently) was related. SpamHaus.org blocks Email Relaying through Zoomabb cell providers I closed the spammer and now everything is working fine ...  
 Hopefully someone else has it If the problem helps ...