Admin account not authenticating with email client suddenly

What type of hardware are you using: VPS bought online
What YunoHost version are you running: 12.1.39
How are you able to access your server: The webadmin
SSH
Direct access via physical keyboard/screen
Are you in a special context or did you perform specific tweaking on your YunoHost instance ?: NO

Describe your issue

Email server stopped validating my admin credentials for checking email. So I checked the logs and found Postfix error messages and need some interpretation on what they mean. I have checked other non admin credentials for login into email and they work fine without any error messages.

Share relevant logs or error messages

It is one specific email address… the one tied to Yunohost first admin account. Other admin accounts added after the first one emails work fine and the system connects, accesses mail, sends mail, ect. without any errors. I am so confused as to why this is happening all of a sudden and why only the one email address is affected?

**Bumping**

Hi,
Your postfix log seems to be related to the diagnosis. It is the yunohost Ip when the diagnosis run and test your server, nothing to do with your problem.

I don’t understand, how do you check your emails? With a client like roundcube/snappymail?
you could regen-conf postfix/dovecot , perharps it helps

yunohost tools regen-conf postfix --force
yunohost tools regen-conf dovecot --force

Also check that your user has email permissions

I use an internal deployment of Afterlogic Webmail Lite. It has worked for me and has been stable thus far. In a year this has been the only issue. It authenticates all other accounts except the main account now. I just installed snappy to test connectivity with said account and got in. But, When I try to use the webmail lite it tells me wrong username or password and to contact system admin. All other account authenticate and send mail fine. So, if it is a permissions issue surrounding that admin account, how would i fix that?

You mean this one GitHub - afterlogic/webmail-lite: AfterLogic WebMail Lite PHP. Fast and easy-to-use webmail front-end for your existing IMAP mail server, Plesk or cPanel. · GitHub

It looks abandoned, last activity 7 years.

If you are able to connect using other apps, then the problem is with that specific app.

I really advise you to stop using it and switch to something actively maintained.

You can also use mobile and desktop clients.

I will leave snappy installed since it is a supported mail client. But, the project is not abandoned and it still is getting active updates. Maybe they have not published on Git those revisions. The following screenshot comes from their website and my version matches this. I will treat it as an active personal hobby and use a supported client on YNH for simplicity and stability. I just like the customization options of that client as I have used it else where for many years without any major setbacks. Thank you for the information and best practice advice

One thing that bothers me and this is why I was using another mail client is the flag that you get everytime you go to load snappymail. It always makes me reload the page to get to my mailbox

Figured it out. Wasn’t aware Snappymail had it’s own security policies. The issue is resolved and I have a dedicated, functioning webmail again. Thank you to everyone who donated thier time to help me figure things out and get me on the right track