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man qmail-send excerpt:

List of virtual users or domains, one per line. A virtual user has the form user@domain:prepend, without any extra spaces. When qmail-send sees the recipient address user@domain, it converts it to prepend-user@domain and treats it as local.

A virtual domain has the form domain:prepend. It applies to any recipient address at domain. For example, if

is in virtualdomains, and a message arrives for, qmail-send will rewrite the recipient address as and deliver the message locally.

virtualdomains may contain wildcards:


virtualdomains may also contain exceptions: an empty prepend means that domain is not a virtual domain.

qmail-send handles virtualdomains after locals: if a domain is listed in locals, virtualdomains does not apply.