Mail users on Plesk server are unable to receive or send messages: 454 4.7.1 Relay access denied – Plesk
![Non-Delivery Report: [550 5.4.1 Recipient address rejected: Access denied] – Exclaimer Knowledge Base Non-Delivery Report: [550 5.4.1 Recipient address rejected: Access denied] – Exclaimer Knowledge Base](https://exclaimerkbimages.blob.core.windows.net/images/Exclaimer%20Cloud/New%20UI/MailRouting4.png)
Non-Delivery Report: [550 5.4.1 Recipient address rejected: Access denied] – Exclaimer Knowledge Base
Unable to send email from Plesk server using Outlook as mail client: 554 5.7.1: Client host rejected: Access denied – Plesk
Unable to send email from Plesk server using Outlook as mail client: 554 5.7.1: Client host rejected: Access denied – Plesk
Mail users on Plesk server are unable to receive or send messages: 454 4.7.1 Relay access denied – Plesk
![Emails sent through a mailing list in Plesk to external mailboxes are not received: Relay access denied – Plesk Emails sent through a mailing list in Plesk to external mailboxes are not received: Relay access denied – Plesk](https://support.plesk.com/hc/article_attachments/12377714690327/Screenshot_2020-04-15_Plesk_Obsidian_18_0_26.png)