I'm running ISPConfig on an Ubuntu Fiesty machine with PHP version 5.2.1 Every time I try sending something through PHP using SMTPauth I get the following error. SMTP Error: Data not accepted. The e-mails still occasionally go through. I think this is something with it timing out. Is there any way to increase the timeout time using SMTPauth? This use to work however has stopped when upgrading to a new version of PHP it has become very finicky.