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I've an apache CentOs server wich is used for an internal wordpress in my company.
This server is not accesible from outsite the company.
I've just installed a postfix service in order to send emails from the wordpress... the problem is that all the emails goes to the spam folder and after 5 or 6 the server is included to the Blocklist and any email is sended anymore.
Please, any help???
Service unavailable; Client host [18.104.22.168] blocked using Blocklist
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Your problem sounds more like a generic postfix problem - rather than an issue with postfixadmin (a web interface for configuring mailboxes and aliases).
I'd suggest you ensure Postfix is configured to relay mail to a known internal server (i.e. the exchange server) and it probably needs to use authentication (authenticated smtp relaying).
Thanks a lot for the information. In fact I am completally lost with this....
something like https://www.zulius.com/how-to/set-up-postfix-with-a-remote-smtp-relay-host/ might be a good start?