Here continue to be some easy to follow methods that can help resolve the Domain 501 Requested error.
If you get a matching 501 error message "Domain must always be fixed", you need to contact your own hosting provider and/or messaging service provider and try to understand them to add the particular PTR record for your email node via its backside. -Add DNS. It is the responsibility of your DNS manager to add reverse DNS records for its IP address used by our families.
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This means that the ISP's mail server is using our domain.Com part of the email message address often cannot be found.
What does "501 571 This process is not configured for email exchange" mean??
If you see the message "501 5.7.1 This system is not configured for email forwarding! SMTP validation money failed" received symptoms:
This often means that the address associated with the message is usually definitely not valid or the inspiration of Settings → Local E-mail → Default Domain is incorrect. This parameter must be a valid internet email domain.
What is SMTP error 501 or how to fix it?
In the vast majority of cases, the SMTP 501 error is caused by invalid email software addresses, an invalid domain phone of the recipient, or a Unix/Linux SEND MAIL command that may not conform to established methods. In practice, a typical personal error message returned might be "No association with any recipient. The remote host says: 501 Bad address."
If everyone knows that the FROM contacts used by clients are correct, try calling the ISP to verify their settings – it's not uncommon for their servers to feel misconfigured.
I have an unusual problem with Postfix. This is the first screenshot using tcpdump on postfix. This led to another "501 me The domain must allow" error.
I tried logging manually when it comes to entering the information captured in tcpdump on putty, but I got a different result.