send password dosnt work!
send email is correctly in news letter and smtp setting but in forgotten password not work
show message send email but no receive any email
log event is:
Message: System.Net.Mail.SmtpException: The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.5.1 Authentication Required. Learn more at at System.Net.Mail.MailCommand.CheckResponse(SmtpStatusCode statusCode, String response) at System.Net.Mail.MailCommand.Send(SmtpConnection conn, Byte[] command, String from) at System.Net.Mail.SmtpTransport.SendMail(MailAddress sender, MailAddressCollection recipients, String deliveryNotify, SmtpFailedRecipientException& exception) 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

The important part of this message is: The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.5.1 Authentication Required.

This means that either (1) The host or admin user sending the mail (Use the SMPT Test link in Host Settings, which sends from the Host address) isn't allowed to send or (2) the address of the email isn't allowed.

Many (most?) email systems have restrictions to eliminate spam. You'll need to work with whoever manages the SMTP server to make sure that it is configured for your needs. Also, the SMTP server logs will tell exactly what the problem was.