/modules/gallery/config/sendmail.php

$config["from"] = "admin@gallery3.com";
$config["line_length"] = 70;
$config["reply_to"] = "admin@gallery3.com";
$config["header_separator"] = "\n";

i know it only takes a few keystrokes to change those values suite your requirement, but i think it should default to the uid/whoami@yoursite.tld or uid/whoami@subdomain.yoursite.tld the Gallery 3 site is running off.

in Gallery 2, i think it gets that info from ~/gallery2/lib/tools/po/shtool
for the values of uid, whoami, domain name and hostname (via uname -a)

i'm not sure if i should file a enhancement ticket or not, any thoughts?

http://sourceforge.net/apps/trac/gallery/ticket/1216

Dave
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Blog & G2 || floridave - Gallery Team