local domain mailenable and plesk

[lorella]

In my connector >> smtp it is impossible to insert local domain name.
Plesk has created postoffice " home" and I don't now succeed in entering the propieties smtp.
I have inserted my dominion exact but me for a long time error.
Please as I can do

thanks

Lorella....... desperate

today I have found in mail box more than 500 mail all equal ones
"MailEnable: Message could not be delivered to some recipients.
The following recipient(s) could not be reached:"
and if I cannot go to the options smtp I cannot stop it