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From: Doctor Who <doc@tardis.org>
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Subject: Re: Attempt to send email using AWS results in Socket closed by peer
Date: Fri, 03 Sep 2021 21:33:15 +0200
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On Fri, 3 Sep 2021 11:11:41 -0700 (PDT), Juan Rayas
<juan.m.rayas@gmail.com> wrote:

>On Friday, September 3, 2021 at 1:59:33 AM UTC-7, Doctor Who wrote:
>> On Fri, 3 Sep 2021 09:32:27 +0200, "Dmitry A. Kazakov" 
>> <mai...@dmitry-kazakov.de> wrote: 
>> 
>> >On 2021-09-03 00:19, Randy Brukardt wrote: 
>> >> "Dmitry A. Kazakov" <mai...@dmitry-kazakov.de> wrote in message 
>> >> news:sgol48$r20$1...@gioia.aioe.org... 
>> >> ... 
>> >>> Most mail servers do not accept unencrypted connections. 
>> >> 
>> >> That's news to me, as my mail server (you know, the one that runs 
>> >> Ada-Comment and the other ARG lists) doesn't support encrypted connections. 
>> >> I don't have any problem sending to GMail (I send copies of most of my 
>> >> personal mail there). Something else must be wrong. 
>> > 
>> >The question is with what settings. There are hundreds of combinations 
>> >of Port x unencrypted|StartTLS|TLS x authentication method. 
>> > 
>> >The port 465 was intended for TLS, then it was depreciated. Then they 
>> >introduced other ports. Legacy mail servers pissed that all on etc. 
>> > 
>> > From experience, getting a SMTP client working is real pain.
>> he is better off using his own provider's mail server on port 25, it 
>> will accept username/password as authentication.
>Hi all,
>
> thank you for your comments and responses.
>
>I tried changing the port number to 25, using the default port number in the SMTP.Client.Initialize procedure, and using other port numbers such as 587. I even tried just initializing the SMT server and sending the email (without authentication) as indicated in https://docs.adacore.com/aws-docs/aws/working_with_mails.html.
>
>In all cases, I get the following error:
>
>Can't send message :530 5.7.0 Must issue a STARTTLS command first. u7sm5705829pju.13 - gsmtp
>
>The problem is I don't know how to send the STARTTLS command with AWS. Anyone know how?
>
>My past experience was mostly with real-time embedded systems, so I don't have a lot of experience with email servers. I didn't expect this to be so difficult. Since this was mostly a toy to learn Ada, I may move on to other aspects of Ada for now.
>
>Thanks for all your comments.
>--Juan


you have to change mail server:

  Isp :=
        SMTP.Client.Initialize
          ("smtp.gmail.com", Port => 465, 
           Credential             => Auth'Unchecked_Access);

don't use gmail, use your provider mail server ...