Michael, your table (specifically the second to last entry)
        is not accurate...

        with user+extexample.com and table entry of

        example.com luserexample.org

        The rewrite is luser+extexample.org:

        Prior to 200102028pl05 there was another case that came out wrong:

        userexample.com example.org

        with rewrite to user+ext+extexample.org without the patch, and
        user+ext with the patch. For full disclosure the released patch is
        not the whole story (partly my fault), the correct code is:

    if ((string = mail_addr_find(path, address, &extension)) != 0) {

        /*
         * Prepend the original user to otherdomain.
         */
        if (*string == '') {
            buffer = vstring_alloc(100);
            if ((ratsign = strchr(address, '')) != 0)
                vstring_strncpy(buffer, address, ratsign - address);
            else
                vstring_strcpy(buffer, address);
            if (extension)
                vstring_truncate(buffer, LEN(buffer) - strlen(extension));
            vstring_strcat(buffer, string);
            string = STR(buffer);
        }

        /*
         * Canonicalize and externalize the result, and propagate the
         * unmatched extension to each address found.
         */
        argv = mail_addr_crunch(string, propagate ? extension : 0);
        if (buffer)
            vstring_free(buffer);
        if (msg_verbose)
            for (i = 0; i < argv->argc; i++)
                msg_info("%s: %s -> %d: %s", myname, address, i,
argv->argv[i]);
    }

> From: Michael Tokarev
> []
> > What would I use to get the original username if "virtual" had:
> >
> > domain.com someuserotherdomain.com
> >
> > and mail was sent to xyzzydomain.com (note: no extension). I think
>
> Aha. This makes sense. And this *is* documented in virtual(5) manpage.
>
> Let's draw a table:
>
> rcpt address vkey vval result
> ab.c ab.c xy.z xy.z
> b.c xy.z xy.z
> b.c y.z ay.z
> a+eb.c a+eb.c xy.z xy.z
> ab.c xy.z x+ey.z <==
> b.c xy.z xy.z <====
> b.c y.z a+ey.z <==
>

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