If you haven’t set up your email account correctly and try to send an email from it, then there is a chance for the SMTP relaying denied error to occur. Usually, when you send an email, first, it is verified by your mail server. i.e., the sender’s mail server.
Step 1:
Unknown user
Step 2:
The sender email account is not configured correctly.
Step 3:
The sender’s email message fails to satisfy the Spam filtering policy of the mail server.
Relaying Denied Error On SMTP
Step 1:
Click your Outlook server’s mail logs.
Step 2:
When prompted, enter the correct username and passwords in the given fields.
Step 3:
After entering your Outlook account credentials correctly, verify if the SMTP relaying denied problem is solved.
Step 4:
If not, enable the SMTP authentication settings option on your Outlook application by following the instructions given below.
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