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The “550 5.7.1 relaying denied” error occurs when a mail server rejects an email because it lacks permission to relay (forward) the email through that server. This can happen if the email fails authentication checks or if the server settings don’t allow relaying from certain IP addresses or domains.
If you encounter “554 5.7.1 relay access denied” in Gmail, check your email settings for authentication methods like SPF, DKIM, and verify that your IP or domain is authorized. This can help prevent Gmail from blocking or denying access to your emails.
The "Relay Access Denied" error message you are encountering even after enabling TLS suggests that there are issues with the way your email server is recognised or authorised by the Office 365 SMTP relay service.
8 Ιουλ 2024 · The Exchange SMTP error 550 5.7.1 Unable to relay may appear in Exchange 2016, 2013, 2010, or 2007 when an Exchange user tries to send email messages outside the domain between Exchange client (such as Outlook) and server. This error indicates a problem with Exchange server email delivery as messages sent are not delivered to the recipient.
19 Ιουν 2018 · The "Server Error: Relay Access Denied 554 5.7.1" in Outlook occurs for two main reasons. The first reason is that your outgoing mail server (SMTP) doesn't allow to send emails without user authentication and the other reason is that your email address is marked at spam lists as a source of spam.
Symptom. When you're away from home and send an email message using your home email account, your email message might be returned with a 550, 553, or relay-prohibited error message. The same situation could occur when you're away from your office and try to send an email message using your work email account.
28 Σεπ 2018 · This message "Relay access denied" or "Relay not permitted" means that the mail server received a message for a recipient at a domain that it doesn't handle email for, and it is refusing to accept it on that basis.
