SMTP username's does not use domain

[Bartas]

Hello,

We are using directadmin v.1.43.0. Since yesterday users can not connect to SMTP using their usual usernames in <user@domain> form. Server complains about wrong username/password. Using username as <user> (without domain) does work for the main domain only.
The same is for old and new users.
Pop3 and webmail console are working as usual.

Please help.
Thanks.

 

[Bartas]

Found it.The file /etc/virtual/limit had the value of 500 written into it.
Changed it into 0 and exim started accepting full (user@domain) usernames.