problem with paid emails being sent

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hello

I have found that when paid invoices are being sent that they are not sending correctly, any ideas to why?

 

Problems are:

1. Email with paid invoice has no subject line

2. The copy of the emial is as follows:-

<p><a href="http://mydomainname.com" target="_blank"><img src="https://mydomainname.com/index_02.gif" border="0"></a></p><font style="font-family:Verdana;font-size:11px">

 

and thats all

 

Any suggestions where to look to fix

 

thanks

Ian