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Sending email from your server
Outbound SMTP is blocked by default on new servers. Ports 25, 465 and 587 are closed until you ask.
Why
Compromised servers send spam, and one abusive machine gets an entire IP range blacklisted — which hurts every customer on it. Closing SMTP by default and opening it on request is what keeps our address space in good standing.
Providers who leave it open for everyone end up with mail nobody accepts.
How to get it opened
Open a ticket telling us which server, what you are sending, and roughly what volume. For legitimate use this is usually enabled the same day.
Not for bulk or cold email. We do not open SMTP for marketing blasts or cold outreach. A dedicated email service provider is the right tool, and it will deliver far better than a VPS ever will.
You may not need this at all. If your application only sends occasional mail — password resets, receipts, alerts — an API-based provider is simpler than running a mail server, and your mail is far less likely to land in spam.
Related
Still stuck? Open a ticket — tell us what was missing and the article gets fixed.