Re: Qmail to Gmail ( invalid From header)

On 28/08/18 14:43, Rejaine Silveira Monteiro wrote:
> Hello people,
>
> I have a Qmail server with a alias called .qmail-test (example) and I
> am trying to forward messages sent to this alias to a Gmail account,
> but it is being rejected by Google with the error: invalid From
> header.
>
> Emails sent by mail clients (Outlook, Thunderbird etc) are OK, but
> some applications that send automatic emails using java, phpmail, etc
> are being rejected with the above error (some do not have access to
> the code because they are third-party applications) Qmail to another
> Qmail are OK too.
>
> Any idea how to solve this?
>
>   I have not tested with another SMTP tool other than Qmail (ie:
> Postifx), but I would like to keep Qmail ...
>
My guess is that Google is checking that the domain of the From email 
address

a) resolves to an IP
b) has MX record(s) that resolve to the IP of the server that delivered 
the email to Google.

You could try setting /etc/mailname to such a domain or ensure the 
domain (which might be the server domain name) resolves correctly.

You should also check if the errant mail clients (java, phpmail, etc) 
either use /etc/mailname or have config to let you set the From address.