SMTP Error From Remote Mail Server

SMTP Error From Remote Mail Server

  • Step 1: Most of the mail users face the SMTP error from remote mail server after the initial connection setup, or the RCPT TO error in their Outlook account or Windows 8/ Office 2010 device.
  • Step 2: If your email server fails to authenticate your SMTP connection correctly, then there is a chance for the error RCPT TO to occur. Error 503 indicates the RCPT error. The below section explains the causes and solutions for the SMTP error from the remote mail server.

Causes and solution for SMTP error from the remote mail server after the initial connection setup

  • Step 1: If you face this error while sending a mail for the first time after configuration, then it might be due to a fault in the initial connection setup.
  • Step 2: First, check your internet connection status.
  • Step 3: If the internet connection is weak or not stable, then contact your Internet Service Provider to solve this issue.
  • Step 4: After connecting your device to a stable internet, try to send the email message. Then check the SMTP error from remote mail server is resolved.

Causes for this error after RCPT TO error

This error message occurs due to a number of reasons. But in most cases, the bounce message, wrong configuration or authentication errors, and sending an email message to a blacklisted email address are the main causes of this error. In the bounce message, you can find detailed information about the error message. The RCPT TO command provides detailed information about the recipient’s data. As a result of this issue, the mail delivery error might occur. 

Solution for configuration error

If the mail client or mail from configuration settings are incorrect, then there is a chance for authentication or configuration error to occur. The mail server configuration issue may also lead to the authentication error. 

  • Step 1: The authentication error message will be displayed in the below format <user@domain.com>: host domain.com[xx.xx.xx.xx]: 550 – Please turn on SMTP Authentication in your mail client. 550 – (host.domain.com) [yy.yy.yy.yy]: is not permitted to relay through this server without authentication.
  • Step 2: To solve this issue, check your mail client settings.
  • Step 3: If required, reconfigure the mail client setting.
  • Step 4: Ensure to enter the SMTP server and port number details correctly.
  • Step 5: After reconfiguring the mail client settings, try to send the email message.

Solution for Domain blacklists

The blacklist option is used mostly by the mail servers. Using blacklists, you can block and prevent your email account from inbound spammers. Your server IP address will also be blacklisted if it is marked as a spam origin by the blacklist providers. Spamhaus is one of the blacklist providers. The account holder will get alert on this error only if the users complain about mail errors. The domain blacklist error will be displayed as follows.

SMTP error from the remote mail server after RCPT TO: : host host.domain.com [xx.xx.xx.xx]: 554.5.7.1 Service unavailable; Client host [yy.yy.yy.yy] blocked using zen.spamhaus.org; http://www.spamhaus.org

To solve the SMTP error from remote mail server issue, try to avoid being blacklisted. To get remote assistance, click Call.

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