Web Reference: Mar 25, 2015 · Postfix' default configuration on Ubuntu allows relay access only on the local interface (i.e. localhost). When connecting on other interfaces (VM network), it requires SMTP authentication. So you could either add authentication to your SMTP call or add your host ip to the allowed relay networks. Dec 21, 2023 · To correct the "Relay Access Denied" error in Postfix, you need to configure your Postfix server to allow legitimate users or hosts to relay email through it while rejecting unauthorized relay attempts. Sep 23, 2011 · Eventually I'd like to have a play with horde but for now I intend to setup roundcube, if there not being a client in place yet wouldn't cause the no imap support error to come up does anyone have an idea what might be causing this or what I can try to fix it?
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