|OS type and version:||Ubuntu 18.04|
|Related products version:||Postfix 3.3.0|
I’m not able to send mail from a specific email address. Here’s what I did. I created a new virtual server (sub server under another one). I created this without mail features enabled. Someone, created an email address on this server while the mail features were disabled. Later I enabled mails by going to Edit Server page.
Now, trying to send emails from this account using Usermin I get this error:
Failed to send mail: SMTP command rcpt to: <email@example.com> failed : 450 4.1.7 <firstname.lastname@example.org>: Sender address rejected: unverified address: User unknown in virtual alias table
I tried deleting the account and recreating. I also tried deleting entire virtual server and recreating but still getting this problem. If I create another email like
email@example.com, that works.