BBS:      TELESC.NET.BR
Assunto:  FMail and SMTP
De:       Tommi Koivula
Data:     Fri, 10 Apr 2026 08:11:28 +0300
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On 8.4.2026 14.26, Wilfred van Velzen wrote:

> >> I was looking at the code, and it turns out on both linux and windows
> >> it uses the gethostname() function (which is posix) to get the string
> >> to put behind the HELO command.  On linux this returns the same string
> >> as the 'uname -n' command. On windows it's the output of the 'hostname'
> >> command. And probably just the computer name, something Michiel could
> >> set himself if he likes to experiment with this. ;-)
>
> TK> So it *IS* working pretty much as it should. ;-)
>
> You would guess so given the function name. But in practice it's not
> (see Michiels test)...

Yep. Never trust Windows. :D

But being pretty old smtp client, even if it gets over this helo thing, FMail will face more problems communicating with modern smtp servers.

None of the big mail providers, (Google, Microsoft..) do not accept unauthenticated mail from an old mail client and from dynamic ip. :)

I think the only reasonable way is to send via smarthost that can add all needed information (DKIM signing etc..).

'Tommi

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