This message is probably the first of three related to this subject.
I have built a simple virtualmin system (mydomain.com) that has one virtual server (myvps). Note: I plan to use my domain registrar for managing DNS records, but I have not yet pointed them to the new server.
On the virtual server, the default user name is name username.domain. Thus, the username is user.myvps. From webmin->System->users and groups, I changed the username to email@example.com. I successfully installed and tested horde - was able to log in as a user and send an email (thus suggesting that the username and password are known and correct).
This morning, I tried to configure Outlook to access the new server. The POP3 connection worked fine, but I could not connect to the SMTP server. I tried both user.myvps and firstname.lastname@example.org, but both times the login credentials were not accepted.
I saw one post where someone recommended, ""Dovecot" -> "Edit Config FIle": Uncomment the line "#disable_plaintext_auth = no". This is not exactly related, but I did look at webmin->servers->Postfix->SMTP Authentication And Encryption and saw that the box 'Reject plain-text logins' was unchecked.
Can you please suggest what I might do to resolve this problem?