Send Mail issues - Error 553

[BoarderLine]

Apache/2.2.13 (Fedora) , PHP/5.3.1

 

I am getting "error 553 sorry, that domain isn't in my list of allowed rcpthosts (#5.7.1)" for smtp mail server roundcube.  At first I thought this was a server config issue with Authentication etc.  I can get email outs to function by adding the email addresses domain in the rcpthosts file on the server.  However I am told by my host that this is in fact a php related issue.  I have no problems sending mail direct from the roundcube console.  Has anyone any idea what  may be causing this problem from a php side of things?  Any help appreciated - neeeewbish

 

[BoarderLine]

believe it's a headers issue - looking

[PFMaBiSmAd]

The error basically means that you did not satisfy all the relaying restrictions in place and the mail server resorted to checking the 'white' list of allowed recipient domains (in case you were unconditionally permitted to send email to the recipient domain, for example to your own domain hosted at the sending mail server.)

 

Your web host should have then provided information as to which relaying restriction you are not satisfying. Best guess is that either the From: email address is not a valid mail box hosted at the sending mail server or you are required to use SMTP authentication against a valid mail box hosted at the sending mail server.