i have an old problem with multiportal dnn SMTP setting (in site setting, not in host setting)

the site mvx.ir is original site that host smtp setting is configured in host setting and there isn't any problem with send and receive emails.

this DNN has some site in Site-Management: for example one of this sites is mvx.ir/fasba

with fasba.ir alias

to configuring this site for send and receive email i do:

1- create an administrator user with email (info [at] fasba.ir)

2- in security setting i set this user as administrator.

in /Admin/Site-Settings fill in the stmp server setting fields

after click in test smtp setting i get the following errro

There has been an error trying to send the test email. The error is:
There is a problem with the configuration of your SMTP Server. Mail was not sent.

here is EventLog:

Message:User not local; please try a different path. The server response was: Sender address is not valid for your login. Check your email program settings.

i test the smtp server with 587 port and the EventLog message change to the following:

AbsoluteURL:/Default.aspx

DefaultDataProvider:DotNetNuke.Data.SqlDataProvider, DotNetNuke

ExceptionGUID:dfc74132-8744-4175-bd42-209a6d027186

AssemblyVersion:

PortalId:-1

UserId:-1

TabId:-1

RawUrl:

Referrer:

UserAgent:

ExceptionHash:Znme/DPldvpYXvuQ4zSpFw==

Message:Failure sending mail.

StackTrace:

at System.Net.Mail.SmtpClient.Send(MailMessage message)

at DotNetNuke.Services.Mail.Mail.SendMailInternal(MailMessage mailMessage, String subject, String body, MailPriority priority, MailFormat bodyFormat, Encoding bodyEncoding, IEnumerable`1 attachments, String smtpServer, String smtpAuthentication, String smtpUsername, String smtpPassword, Boolean smtpEnableSSL)

InnerMessage:Smtp server returned an invalid response.

InnerStackTrace:

at System.Net.Mail.SmtpReplyReaderFactory.ProcessRead(Byte[] buffer, Int32 offset, Int32 read, Boolean readLine)

at System.Net.Mail.SmtpReplyReaderFactory.ReadLines(SmtpReplyReader caller, Boolean oneLine)

at System.Net.Mail.SmtpReplyReaderFactory.ReadLine(SmtpReplyReader caller)

at System.Net.Mail.SmtpConnection.GetConnection(ServicePoint servicePoint)

at System.Net.Mail.SmtpTransport.GetConnection(ServicePoint servicePoint)

at System.Net.Mail.SmtpClient.GetConnection()

at System.Net.Mail.SmtpClient.Send(MailMessage message)

Source:System

FileName:

FileLineNumber:0

FileColumnNumber:0

Method:

Note: there is no any problem with Host SMTP setting

i don't have any idea to this issue. any idea please