I had setup zcs 4.5.10 opensource version, with 100 mailbox account in production. clientis using microsoft outlook.
1) In 100 account, 2 accounts are not able to send the mails to outside world.
But i can send the mails tooutside world from their webmail account.
what will be problem ?
2) when i connecting through my zimbra server using telnet on port 25
and sending mail as below
MAIL FROM:email@example.com (local user)
RCPT TO:firstname.lastname@example.org (outside world)
554 relay access denied
where to make changes exactly, to allow to send mail by above method i.e it should not give relay access denied when i am sending from local to outside world.