If you are using a default address to catch all the invalid and unrouted emails to your domain, some open relay testing services will show that your domain is open relay. But in fact, it is not open relay. The test they are performing is flawed in that context.
In any case, we strongly recommend that you DISABLE the default address and do NOT use catchall which is often abused by spammers.
In any case, we strongly recommend that you DISABLE the default address and do NOT use catchall which is often abused by spammers.
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