hi, is there any security problem with the smtp proxy ?
our proxy is configured to relay only email from internal network. common internet smtp relay check tools say, they cannot relay from out smtp server.
but in the last few weeks we got some returning emails, sended by spamer with our domainname as outgoigng domain . in the email header our email server occurs once. it seemed he has got the email from an external client.
PLEASE HELP, URGENT.
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