Zimbra open relay
Posted: Wed May 23, 2018 10:35 am
Hello,
I came across strange problem with open relay on Release 8.8.8_GA_2009.RHEL7_64_20180322150747 RHEL7_64 FOSS
I installed new Zimbra server, made some changes in web administration console, changed MTA trusted network to our VLAN's IP ranges. Everything works as it should.
Today i started to test if our server is not working as open relay form internet.
I made telnet to mail server from internet on tcp port 25 and then HELO mydomain.com
mail from: someadrss@notmydomain.com
rcpt to: someadress@somedomain.com then i get Relay access denied - that is good
Then i tested with:
telnet to mail server on tcp port 25 and then HELO mydomain.com
mail from: someadress@notmydomain.com
rcpt to: me@mydomain.com then i get 250 2.1.5 Ok response
And if i entered all other commands from telnet mail was successfully delivered.
Strange, system acts as half of open relay
I have tested this on 2 Zimbra mail servers Release 8.8.8 and i found same behaviour.
Is this normal for zimbra server? Or is something wrong configured on default configuration of postfix?
Best regards,
I came across strange problem with open relay on Release 8.8.8_GA_2009.RHEL7_64_20180322150747 RHEL7_64 FOSS
I installed new Zimbra server, made some changes in web administration console, changed MTA trusted network to our VLAN's IP ranges. Everything works as it should.
Today i started to test if our server is not working as open relay form internet.
I made telnet to mail server from internet on tcp port 25 and then HELO mydomain.com
mail from: someadrss@notmydomain.com
rcpt to: someadress@somedomain.com then i get Relay access denied - that is good
Then i tested with:
telnet to mail server on tcp port 25 and then HELO mydomain.com
mail from: someadress@notmydomain.com
rcpt to: me@mydomain.com then i get 250 2.1.5 Ok response
And if i entered all other commands from telnet mail was successfully delivered.
Strange, system acts as half of open relay
I have tested this on 2 Zimbra mail servers Release 8.8.8 and i found same behaviour.
Is this normal for zimbra server? Or is something wrong configured on default configuration of postfix?
Best regards,