SMTP error 547 occurs when the email server timeout while sending an email. It is usually due to the sender's email server being unable to reach the recipient's email server within the timeout duration.
It may be due to inconsistent network connectivity or the unreachability of the recipient's email server.
To resolve this error, ensure that the recipient's email server is reachable and is accepting emails.
It is also essential to ensure that no public or private blocklists contain the IP address and domain of the email server.
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