SMTP authentication is required.

I run a Windows Server 2008 server which is hosting email using hMailServer. SMTP ports are open (verified using portscan). When I try to send an email to juliemullins@***.com (in screenshot attached) I get the following bounceback -

mail.***.co.uk gave this error:
SMTP authentication is required.

where mail.***.co.uk is my mail server.

Log file from hMailServer -

 Log from hMailServer
This was working last time I checked a few days ago and can't seem to work out what's going wrong.

Thanks
mbaughanAsked:
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mbaughanConnect With a Mentor Author Commented:
Turns out this was the problem -

hms settings / advanced / ip ranges /

the internet range should say

external to local and authentication should not be ticked otherwise no external emal will be able to send to you without knowing your password.

local to local, local to external, usually have authentication ticked.

external to external should always have authentication ticked otherwise you become an open relay which is a bad idea. And if you don't need external to external then untick it so no external email can use your server to send email.
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EddyvanOpdorpCommented:
You need to disable the authentication for smtp in the configuration of hMailserver

http://www.hmailserver.com/documentation/v5.4/?page=reference_protocolsmtp
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mbaughanAuthor Commented:
SMTP authentication is already disabled.

Thanks

SMTP Screenshot
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mbaughanAuthor Commented:
I should update this - julie@***.com is the domain which is hosted on the hMailServer. Matt@*** is not on this server at all.

Thanks
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mbaughanAuthor Commented:
I found the solutions to be the above.
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