Select "Settings" on the context menu. Click the "Outgoing Server (SMTP)" heading on the left side of the Account Settings window. Look for your SMTP settings on the bottom half of the window.

Change the outgoing SMTP server port settings Most ISPs use either port 25 or port 587 as the outgoing port number, so while by default Mail may put port 25 as the outgoing port number, users ...

Thunderbird only (Windows/Mac/Linux): Experimental Thunderbird extension SendVia changes your outgoing SMTP mail server on the fly while composing a message. Using the extension is as simple as ...

I tried changing the Outgoing Server (SMTP) in Account Settings from port 25 to port 587 but still get the same message.

Click on the "Servers" tab along the top of the page. Click on the box next to "Outgoing Mail (SMTP)." This is where the current outgoing mail server is located.

So I have to change my outgoing SMTP server in OS X. Easy enough, except for this: the Mail.app prefs only show a single server for config, while the Internet panel in System Prefs offers separate ...

After that, move to the Advanced tab, and inside the Outgoing server (SMTP) box, change the port number to 465. Now, set SSL as the encrypted connection type.

For years, POP (Post Office Protocol) email has been a thorn in my side. Apple's email service uses the IMAP (Internet Message Access Protocol) protocol for email, as do many other email services.

This means that I need to change my SMTP server setting to match the server of the provider I am connected to, or use the Web interface provided by my provider.

This list is a companion piece to the Secure Web server installation portion of SearchSecurity.com's Intrusion Defense School lesson on Web attack prevention and defense. Check out the companion ...