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From: Simon Wright <simon@pushface.org>
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Subject: Re: Attempt to send email using AWS results in Socket closed by peer
Date: Fri, 03 Sep 2021 21:35:11 +0100
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Juan Rayas <juan.m.rayas@gmail.com> writes:

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

I succeed sending mail via gmail.com using port 587.

No useful further details on encryption - this was for the membership
d/b for a small club, and it's in Python/sqlite.

    self.server = smtplib.SMTP(host=self.server_details['host'],
                               port=self.server_details['port'])
    self.server.ehlo()
    self.server.starttls()
    self.server.ehlo()
    self.server.login\
        (user=server_details['user'],
         password=keyring.get_password\
           ('u3a-email', server_details['user']))