On 10/27/2017 10:56 AM, Simon Hobson wrote: > [email protected] wrote: > >> Eh, except I got bounced with: >> >> SMTP error from remote mail server after RCPT TO:<[email protected]> >> : >> 504 5.5.2 <ns2>: Helo command rejected: need fully-qualified hostname > You would sending mail direct to me as well - your mail server is not > correctly configured ! > > Your mail server is identifying itself as "ns2" which is not a FQDN, and one > of the anti-spam measures many people employ (because it's effective and very > cheap) is to reject connections from servers that don't give (as is required > by the RFCs) a FQDN. Many will also do a DNS lookup on it as well, and reject > if it doesn't resolve. > > Running a mail server myself, as well as having run them for work, I can tell > you that a very large number of mail servers are lacking some very basic > settings !
As a matter of fact... my shared hoster has collapsed (as happens so often with the cheapies) and I no longer have access to my 3 domains nor mail settings via cPanel. It doesn't surprise me that they're misconfigured. I'm surprised anything is still up. I've now set up an OpenStack instance to do my own hosting and email, but have not had the time to learn every detail of the sprawling Postfix, and their listserv is characteristically unsympathetic to my questions. If I had such a huge investment in a single application as they do, I might be too. But I have more important things to do like make a living... Postfix is rejecting emails I try to send as "unauthorized relay". And it's rejecting emails others send to me the same. I've now tried Modoboa, but unfortunately the install script crashes at nginx. I've let him know, but no word yet.
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