SMTP error 541 occurs when the recipient's email server rejects the specific email. It may be due to various reasons such as:
If the user continuously experiences this error, ensure that no content within the email resembles spam. This is one of the most common cases since spam filters rely on patterns to detect potential spam emails.
If the issue persists, move to the next step of troubleshooting; gauge the reputation of the sender's email server's IP address, and check if the IP address is within a blocklist. If found within a blocklist, proceed with the appeal process to remove the entry from the blocklist.
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