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I configured Postfix for some virtual domains. When I inspect the headers of messages delivered via my server, one of these domains appears as part of the "Received" header":

Received: from actual.hostname.tld (virtual.domain.tld [1.2.3.4])

Why does virtual.domain.tld appear in this header? It is always the same domain, although Postfix' main.cf contains 9 virtual_alias_domains.

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1 Answer 1

Reset to default
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It is a reverse DNS query

virtual.domain.tld is surely the PTR record for 1.2.3.4

Try: dig -x 1.2.3.4

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