Setting Up Zimbra Collaboration Suite (ZCS) on RHEL/CentOS 7/6

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Matei Cezar

I'am a computer addicted guy, a fan of open source and linux based system software, have about 4 years experience with Linux distributions desktop, servers and bash scripting.

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54 Responses

  1. Brian says:

    Thank you for your detailed instructions. I followed your steps. The system now can received emails but not able to send out.

    I tried to send to gmail but got the following error:

    host gmail-smtp-in.l.google.com[172.217.194.27]
    said: 550-5.7.1 This message does not have authentication information or
    fails to pass 550-5.7.1 authentication checks. To best protect our users
    from spam, the 550-5.7.1 message has been blocked. Please visit 550-5.7.1
    https://support.google.com/mail/answer/81126#authentication for more 550
    5.7.1 information

    I tried to find the solution on google but can’t make it work. Can you please give me some advice? I really appreciate it.

    Thanks

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