Plesk email notifications are not sent to external email addresses in Plesk for Windows Server with MailEnable: Sender address is not valid for your login.

Symptoms

Plesk email notifications configured at Tools & Settings > Notifications are not sent to external email addresses when MailEnable mail server is installed.

One of the following errors may appear:

• in %plesk_dir%adminlogsphp_error.log:

  ERR [panel] Sender address is not valid for your login. Check your email program settings.

• in C:Program Files (x86)Mail EnableLoggingSMTPSMTP-Activity-YYMMDD.log (%plesk_dir%Mail ServersMail EnableLoggingSMTPSMTP-Activity-YYMMDD.log in older Plesk versions):

  SMTP-IN 70B2743EE7C843B7B27BCD4CEEB24FB7.MAI 1808 127.0.0.1 MAIL MAIL FROM:user@example.com 551 Sender address is not valid for your login. Check your email program settings. 84 33 postmaster@localhost

  ---

  503 This mail server requires authentication when attempting to send to a non-local e-mail address. Please check your mail client settings or contact your administrator to verify that the domain or address is defined for this server.
  235 Failed to meet all relay criteria. Attempt to relay to [SMTP:user@example.com] was denied for requesting IP Address 127.0.0.1

  ---

  503 Bad sequence of commands. Could not process RCPT command when in this state 81 32 user@example.com

• in Windows Event Viewer:

  SMTP Exception
  at Unable to execute event(runtask::start line 210)
  Execute file name: C:Program Files (x86)ParallelsPleskadminbinruntask.exe

• in %plesk_dir%adminlogshealth-alarm.log:

  Unable to send e-mail notification: Could not read from <domainname>

Cause

MailEnable mail server configuration conflicts with Plesk: Plesk email notifications cannot be sent when the option Authenticated senders must use address from their postoffice (or Authenticated senders must use valid sender address) is enabled in MailEnable.

Resolution

1. Connect to the Plesk server via RDP.

2. Start MailEnable Management console at Windows Start > All Programs > Mail Enable.

3. In MailEnable Management console, expand Servers > localhost > Services and Connectors > right-click on SMTP and open its Properties.

4. In SMTP Properties window, switch to the Security tab and disable the option Authenticated senders must use address from their postoffice (or Authenticated senders must use valid sender address). Apply the changes.

   

5. Restart the MailEnable SMTP Connector service:

   5.1. In MailEnable Management console, go to Servers > localhost > System > Services Status.

   5.2. Select MailEnable SMTP Connector.

   5.3. Click Restart in the right pane.