465. 2525. Port 25 is commonly used for SMTP relay, but you should not use it for SMTP submission because most providers block it. If you want to configure your WordPress site or email client to use SMTP, you should start with port 587 as your first choice, as it’s the standard port for SMTP submission.
More in detail: port 587 is supported by almost every outgoing SMTP server and it’s useful for unencrypted or TLS connections; while port 465 is the right choice if you need to connect via SSL. turboSMTP can work both on port 587 and 465, but also on 2525 and 25025. Moreover, it completely avoids the “another ISP” issue: in fact, once you have set our SMTP as default you don’t need to configure it again or switch to other ports.
Port 587: The standard secure SMTP port. Modern email servers use port 587 for the secure submission of email for delivery. For example, if you use an email client software like Outlook or Apple Mail, it most likely is configured to use this port to send your messages. It’s not just personal email client software, however.
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SMTP Settings. Microsoft 365. Outlook. Hotmail. Live.com. Server: outlook.office365.com. ...
Your mail client connects to the Twilio SendGrid SMTP server, smtp.sendgrid.net, using port 25 (by default). Your mail client has a conversation with our server, first verifying that the username and password used for authentication correspond to an active account, then relaying the message information, such as sender address, recipient, and message content.
Port: SMTP Server (Outgoing Messages) smtp.gmail.com: SSL: 465 : smtp.gmail.com: StartTLS: ...
IMAP server name outlook.office365.com. IMAP port 993. IMAP encryption method TLS. POP server name outlook.office365.com. POP port 995. POP encryption method TLS. SMTP server name smtp-mail.outlook.com. SMTP port 587. SMTP encryption method STARTTLS
Enter the “ telnet smtp.example.com 25” command to connect to the SMTP server via port 25 (Replace "smtp.example.com" with the address of your own SMTP server.) 3. If the server is reachable, it replies back with status codes 220 and "smtp.example.com ESMTP Postfix", or a comparable plain text message.