I am getting bellow error while trying to send mail from drupal 9 SMTP mail. Please guide.
Error sending e-mail from admin@* to *@gmail.com: SMTP Error: Could not connect to SMTP host.
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As already mentioned this error might be related to the settings you’re using. Google’s SMTP server does not use port 25 and so you’ll need to set either port 465 or 587.
We have an article on How To Use Google’s SMTP Server which you can check here:
This does sound like your port is being blocked. What port are you using, is it 25 or 465/587? If you are using port 25 it’s most probably being blocked. Firstly, I’ll recommend using port 465/587 but if you must use port 25 I’ll recommend contacting the DigitalOcean’s support who will be more than happy to assist you with your account issue! :)
Hope that helps! - KFSys.
Port 25, might be closed for some new accounts. What I would suggest instead is using port 587 or 465 rather than port 25.
Let me know how it goes!