[quote user="mgarreta"]550:<myuser@myinternaldomain.com>: Sender address rejected: Domain not found[/quote]
The relay server at your ISP is refusing to relay mail with a Sender address of myuser@myinternaldomain.com.
This is what you set in your email client program (Pmail, OE, Thunderbird etc.)
[quote]What more must I do?[/quote]
You need to either set this to something that your ISP allows, or get your ISP to allow it.
<p>[quote user="mgarreta"]550:&lt;myuser@myinternaldomain.com&gt;: Sender address rejected: Domain not found[/quote]</p><p>The relay server at your ISP is refusing to relay mail with a Sender address of&nbsp; myuser@myinternaldomain.com.</p><p>This is what you set in your email client program (Pmail, OE, Thunderbird etc.)</p><p>[quote]What more must I do?[/quote]</p><p>&nbsp;</p><p>You need to either set this to something that your ISP allows, or get your ISP to allow it.</p>