![]() SMTP authentication in Thunderbird mail client In Outlook, the option ‘ My server requires authentication‘ in the ‘ Outgoing Server‘ section should be checked to enable authentication.īefore sending email, authenticate the account by providing the mail account username and password. The solution is to configure your mail client to use SMTP authentication. This error 551 occurs when “ SMTP authentication” is not enabled in your email client. Please reconfigure your mail client to authenticate before sending mail. The server response was: 551 This mail server requires authentication before sending mail from a locally hosted domain. The error message shown in the email client, say Outlook, would be as: The server rejected the sender address. This is another error 551 that happens when you try to send email from the email client using MailEnable email server, without properly authenticating it. How to fix “551 This mail server requires authentication before sending mail from a locally hosted domain” Verify the email account settings in OutlookĢ. This error is returned by the mail server while sending mail, and is displayed by in email clients such as Outlook Express. How to fix “551 Sender address is not valid for your login” In those cases, we (as the web host’s support team) help web masters configure their mail clients. Some web hosts value the additional security of the default MailEnable settings. Fixing Error 551 in mail clients like Outlook, Thunderbird, Eudora, etc. It can be done by going to SMTP Properties > Security tab. So, for servers in which Error 551 is common, we recommend disabling this option. However, the setting “ Authenticated senders must use valid sender address” is seen to cause more harm than good. So, we recommend web hosting providers to keep the setting “ Senders from local domains must authenticate to send email” enabled at all times. Mail sending through SMTP authentication is a powerful way to block spammers. RELATED : How to fix email error “554 5.7.1 : Relay access denied” How to fix Error 551 in MailEnable servers In MailEnable servers, the setting “ Senders from local domains must authenticate to send email” is used to enable this feature. Sender not authenticatedĪ mail is accepted by the server only if the sender is authenticated using a password. In MailEnable servers, this is controlled by a setting called “ Authenticated senders must use valid sender address“. Sender or Recipient mail address not authorizedįor an SMTP server to accept a mail into the queue, either the Sender’s Mail Address or the Recipient’s Mail Address should be hosted in the SMTP server. In SMTP protocol, Error 551 is shown when a sender is not found to be authorized to relay mail through the server. ![]() As part of our Outsourced Web Hosting Support services, we use multiple strategies to resolve Error 551.īut before we get into the details, let’s see what this error means: What is SMTP Email Error 551? ![]() ![]() MailEnable is widely used in Plesk web hosting servers, and these errors are often reported to web hosting providers. Email Error 551 is an SMTP error commonly seen in MailEnable servers, and is seen in two forms: 551 Sender address is not valid for your loginĪnd 551 This mail server requires authentication before sending mail from a locally hosted domain
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