DigitalOcean + Siteground Email via port 465 won’t work (2525 will work)

installation
1

Hello,
I started a discourse droplet on digital ocean, what is basically the discourse docker image.
It worked well until I reached the registration step

We sent an activation mail to ** admin.discourse@ourdomain.coop**

but the email never arrived

tail -f /var/discourse/shared/standalone/log/rails/production.log
Sent mail to admin.discourse@ourdomain.coop (61113.9ms)
Job exception: Net::ReadTimeout

so I check if I can send an email via telnet, what worked well but only if using AUTH PLAIN as described on Using Telnet with an SMTP Server « That's Geeky
then it turned out there is a bug as described in
ssl - Why do I get DONE after AUTH LOGIN command? - Stack Overflow

First I changed to port 2525 and I got the email [Discourse] Confirm your new account so I rebuild the app with new password verifying via https://www.base64encode.net/ but once again Job exception: Net::ReadTimeout
so I changed again to 2525 but no email arrives but

tail -f /var/discourse/shared/standalone/log/rails/production.log
Sent mail to admin.discourse@ourdomain.coop (61113.9ms)

without Job exception: Net::ReadTimeout

I’M LOST HERE

grafik
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DISCOURSE_SMTP_ADDRESS: itm13.siteground.biz
DISCOURSE_SMTP_PORT: 465
DISCOURSE_SMTP_USER_NAME: admin.discourse@ourdomain.coop
DISCOURSE_SMTP_PASSWORD: MyPassword

DISCOURSE_SMTP_ADDRESS: mail.ourdomain.coop 
DISCOURSE_SMTP_PORT: 2525
DISCOURSE_SMTP_USER_NAME: admin.discourse@ourdomain.coop
DISCOURSE_SMTP_PASSWORD: MyPassword

no parenthesis, Quotation marketc. used!

2

swaks --to myemail@ourdomain.coop--from admin.discourse@ourdomain.coop --server itm13.siteground.biz --auth LOGIN --auth-user admin.discourse@ourdomain.coop -tls

swaks --to myemail@gmail.com--from admin.discourse@ourdomain.coop --server itm13.siteground.biz --auth LOGIN --auth-user admin.discourse@ourdomain.coop -tls

works

I have just noticed, that the emails send from (that very only time) comes from a different sender than in app.yml set. It is the old hostname, not the new one I’m using for testing, although I’ve been working with the new one only.