Hi, did you take a look at this official wiki guide? https://wiki.zimbra.com/wiki/How_to_obt ... urity_Test

Hi everybody,
I am planning to install latest patch 15 on my Zimbra Open Source Edition 8.8.15 during next weekend: has anyone already installed it in production? Did you run into any issues?

Hi, are there any firewalls between internet and your Zimbra server? Are there any rules regarding these ports? 25 smtp mta incoming mail to postfix 80 http mailbox / proxy web mail client (disabled by default in 8.0) 110 pop3 mailbox / proxy POP3 143 imap mailbox / proxy IMAP 443 https mailbox / pr...

Hi, if only indexes are corrupted you can reindex one or all zimbra mailboxes after restoring email backup. Take a look here: https://wiki.zimbra.com/wiki/Glenno-Not ... _mailboxes

Hi, I do not know Mautic, but if you configure it to not use one of the ports used by Zimbra, I think it should work. Test everything befor using it in production.

Hi,
1- It is preferable to have a fresh installed server. Moreover, Zimbra will bind to ports 80/443 (and some more: https://wiki.zimbra.com/wiki/Ports) by default, so it will conflict with your LEMP stack.
2- You can use free version to create any email address or domain you want.

Hi, I do not know if what you ask is possible using POP/IMAP, you probably have to tinker with your client settings with signature and personas. However, using Zimbra webmail is possible: take a look here https://www.btactic.com/how-to-delegate-accounts-in-zimbra/?lang=en and in zimbra documentation...

Same error https://i.hizliresim.com/ThIbJ6.jpg Ok, then there is some outgoing connection issues with your zimbra server. If I try that telnet from my server I can correctly connect to that outlook.com server. Take a look at routing configuration of your zimbra server; to check if the problem is on...

Yes in firewall 25 port is open. Try this command on zimbra server: telnet hotmail-com.olc.protection.outlook.com 25 Does the communication start? Same error https://i.hizliresim.com/ThIbJ6.jpg Ok, then there is some outgoing connection issues with your zimbra server. If I try that telnet from my s...

Hi, it looks like your server can not connect to other email servers on the internet: is port 25 TCP opened on the firewall for outbound traffic? The error you posted shows that your email server could not connect to outlook.com server 104.47.124.33 on port 25. Yes in firewall 25 port is open. Try ...