I have been having a problem because of the anti spam rules that are implemented in some mail servers.
I have a mx server that has connectors installed to get some email from an outside mail server. our acounts have defined in each an email from this outside email server
my server has the following name config xxx.local
when i send an email to some servers there comes a message that says <server.xxx.local #5.5.0 smtp;554 refused mailfrom because return MX does not exist> and the message it's not sent.
how can i solve this problem?