Many email services make use of the 554 6.6.0 error code. It is common when using internet standard email protocols such as POP, IMAP and SMTP. This error typically occurs when messages are undeliverable due to a server router or other related issue. In order for the message to reach its intended destination, it must be properly forwarded on the network by a router. The following steps can help you troubleshoot and diagnose a 554 6.6.0 error.
How to Fix 554 6.6.0 server error
This error typically shows up when a message is undeliverable, due to either a server issue or router issue. If a message is undeliverable, it can be helpful to troubleshoot and identify the root cause of the issue, so that appropriate corrective action or adjustments can be made.
Step 1: Check your connection and make sure that the internet is working.
Step 2: Make sure that you're using the correct port number. POP and IMAP use ports 995 and 993, respectively; and SMTP typically uses port 587.
Step 3: Check the email headers for the 554 6.6.0 error code and any useful information about the delivery problems.
Step 4: Check your server policies to make sure that the server is allowing routing for the message. In some cases, the server may be configured to reject inbound messages from certain senders.
Step 5: Consider using an email provider other than your server. In some cases, this may improve delivery rates and avoid the problem of undeliverable messages.
Step 6: Make sure all the DNS records associated with your server are configured correctly. If they are not, it can cause routing issues, resulting in 554 6.6.0 errors or other delivery delays.
FAQ
What is a 554 6.6.0 server error?
A 554 6.6.0 server error is an error code that typically occurs when messages are undeliverable due to a server router or other related issue.
What are the most common causes of this error?
The most common causes of this error are a wrong port number, server policies that restrict the inbound messages from certain senders, and incorrect DNS records.
How can I tell if the error is related to my server or the recipient's server?
You can tell if the error is related to your server or the recipient's server by looking at the email headers.
What are some other steps I can take to troubleshoot this issue?
Some other steps you can take to troubleshoot this issue include checking your connection, using an email provider other than your server, and making sure all the DNS records associated with your server are configured correctly.
What are the port numbers for POP, IMAP and SMTP?
The default port for POP is 995, for IMAP is 993 and for SMTP it's 587.