[gentoo-user] Re: Simple SMTP to cmd-line MTA relay?

[Grant Edwards <grant.b.edwards@gmail.com>]

On 2018-01-19, Grant Taylor <gtaylor@tnetconsulting.net> wrote:
> On 01/19/2018 12:48 PM, Alan McKinnon wrote:
>> I'm also wondering why you need 2 bits. Earlier in the thread you 
>> mentioned that you send perhaps a few messages a week and never more 
>> than one connection at a time.
>
> Grant E. has indicated elsewhere in the thread that his
> /usr/bin/sendmail script is speaking something custom to the
> destination mail server.
>
> Read:  /usr/bin/sendmail script is NOT speaking SMTP.

Yes.  I should have been more clear about that. 

> Do you know what protocol(s) that Grant E.'s /usr/bin/sendmail script is 
> speaking?  Do you know if ssmtp (et al) support it?

It involves doing things remotely using the ssh-2 protocol.

> I feel like Grant E. has not revealed enough information to know if
> other things can speak what ever custom communications is possible
> between the SMTP server and the destination mail server.  He has
> only revealed enough to know that it is custom, and that his
> /usr/bin/sendmail interface script must be used.

Yes, I have assumed that normal MTAs like sendmail and postfix do not
implement the ssh protocol and can't be made to do what my
/usr/bin/sendmail script does.

> I don't think there is enough information to know that ssmtp / postfix / 
> exim / sendmail / et al are capable of speaking the protocols that Grant 
> E. needs or wants.

I am confident they do not, but I'm not going to go into details on
how the ssh-protocol-based delivery works.

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