<p>You can also tell MercS to accept 'firstname.lastname' address variants.</p><p>It uses the  'personal name' part of the user definition. </p>

<p>Hi,</p><p>I have this problem now:</p><p> I have a valid user on my mercury mail server, but I have this error all the time: "The local mail transport system has reported the following problems it encountered while trying to deliver your message: ------------------------------------------------------------------- *** <a href="mailto:myuser@mydomain.com" class="moz-txt-link-abbreviated">myuser@mydomain.com</a> 553 We do not relay non-local mail, sorry. ------------------------------------------------------------------- Your mail message is being returned to you in the next part of this message." I just can not imagine what the problem is. I should enable relaying from non-local users? </p><p>  I see a loop from postmaster to admin too. If  I want a name : <a href="mailto:firstname.lastname@mydoamin.com" class="moz-txt-link-abbreviated">firstname.lastname@mydoamin.com</a> what should I do? Create a user 'firstname' and then Alias to it 'firstname.lastname'? </p>

I think a found what was the problem. I had a misconfiguration in the domain section.