> A clear PERMFAIL 5xx is issued.  What do you mean the mail is denied
> but not bounced back?

I meant the mail remains in the queue and qmail keeps on trying to send
it to sourceforge, 
after say about a week it bounces back to me.
I can see that it used to return a 550 error. 

550 Requested action not taken: mailbox unavailable 

So does qmail or whatever MTA tries to send the mails keep on retrying 
for the problem to get solved.
> 
> 1. Checks for a proper HELO - syntactically correct (underscores are
> not valid in HELO for example)
> 
> 2. Makes a smtp callback (connects back to the sending domain's MX and
> 
> verifies if ... 1. the user sending it exists, 2.
> [EMAIL PROTECTED] exists)... only then does it let your mail
> through.

Thanks a lot for this info.


Regards
G.Vinubalaji


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