Question : Whats the meaning of "550 Message does not pass DomainKeys requirements for domain ..."

Hello,

When I send mail to certain domains, i receive this message: "    POP3.bcn.domainxxx.com[192.168.1.4] said: 550 Message does not pass
    DomainKeys requirements for domain yyy.com (in reply to end of
    DATA command)
whats the meaning of this message?, and how i can avoid it?.

Thanks in advance

Answer : Whats the meaning of "550 Message does not pass DomainKeys requirements for domain ..."

Two possible reasons
- Your server has DK signing configured, but it is doing it improperly (DK incompatible)
- There's a server at the message path, that changes/adding message headers improperly(DK incompatible)

It's also possible, that destination server verifies the signature in wrong way - like it forgot to change bare "\n" to "\r\n"