It looks like Gallery2, gallery.menalto.com, has a slight issue with smtp EHLO so here is a little fix to help you out.
Edit lib/smtp/smtp.php and find....
fputs($socket, "EHLO " . $config['smtp.host'] . "\r\n");
It's on line 82 for me. You will need to change that too...
fputs($socket, "EHLO " . 'MY-DOMAIN-NAME.TLD' . "\r\n");
Where MY-DOMAIN-NAME.TLD would be 'rollernet.us' as an example.
And there doesn't seem to be any fix for this in all the gallery2 searching I have done. So you will need to edit this file each time you update the Gallery2 code.
Gallery2 smtp auth errors [FIX]
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