451 Temporary local problem - please try later
If you get this error message when sending a message to a domain, there are two possible solutions to this problem:
- Make sure your server resolves and you do not have a DNS
issue. Run a DNS report on the domain with the problem using www.dnsreport.com or www.intodns.com
- Look into clamAV, if installed on your server, and make sure it is working. If you have an old version, upgrade clamAV to the latest stable version. When you do that, restart exim.
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