Here are instructions for configuring your LPL email client to securely send mail, using any of several popular email programs.

Thunderbird 

• Click Tools -> "Account Settings" -> "Outgoing Server".
• Click Edit.
• In the "Server Name:" field, type hindmost.lpl.arizona.edu
• In the "Port:" field, change 25 to 587.
• In the list next to "Connection security:", select "STARTTLS".
• In the list next to "Authentication method:", select "OAuth2".
• Type your LPL username in the "User Name:" field.
• Click OK.
• Click OK.

Mac Mail

• Click Mail -> Preferences -> Accounts.
• If you have more than one account, click once on the account that you'd like to configure.
• If you already have an outgoing server configured for this account:
  • Click on that outgoing server entry (displayed to the right of "Outgoing Mail server (SMTP)").
  • Click Edit SMTP Server List in the pop-up menu.
  • Type hindmost.lpl.arizona.edu in the "Outgoing Mail Server (SMTP)" field.
  • Click "Advanced".
  • Click the radio button next to "Use custom port".
  • Type 587 in the "Use custom port" field.
  • Click the box next to "Use Secure Sockets Layer (SSL)".
  • Select "Password" in the list next to "Authentication".
  • Type your LPL username in the "User Name:" field.
  • Click OK.
• If you do not yet have an outgoing server configured for this account:
• Click on the word "None" (displayed to the right of "Outgoing Mail server (SMTP)").
• Click Edit SMTP Server List in the pop-up menu.
• Click the + button in the pop-up window.
• Type LPL in the "Description" field.
• Type hindmost.lpl.arizona.edu in the "Server Name" field.
• Click "Advanced".
• Click the radio button next to "Use custom port".
• Type 587 in the "Use custom port" field.
• Click the box next to "Use Secure Sockets Layer (SSL)".
• Select "Password" in the list next to "Authentication".
• Type your LPL username in the "User Name:" field (without @lpl.arizona.edu).
• Click OK.
• Click Show Certificate.
• Click the box next to "Always Trust..."
• Click Connect.
• Type your Mac password to store the certificate in your Mac keychain.
• Click OK.
• The first time you send using Mac Mail, you will see a pop-up regarding security certificate.

Outlook Express (Windows)

• Click Tools -> Accounts -> Mail -> Properties -> Advanced.
• Next to "Outgoing mail (SMTP)", change 25 to 587.
• Check the box next to "This server requires a secure connection (SSL)".
• Click Apply.
• Click OK.
• Click Properties -> Servers.
• In the "Outgoing mail (SMTP):" field, type hindmost.lpl.arizona.edu
• Under "Outgoing Mail Server", check the box next to "My server requires authentication".
• Click Settings.
• Click the radio button next to "Use same settings as my incoming mail server.
• Do not check the box next to "Log on using Secure Password Authentication"
• Click OK.
• Click Apply.
• Click OK.
• Click Close.

Outlook (Windows)

• Click the File tab.
• Click the "Account Settings" button.
• Click the "Add and remove accounts or change existing connection settings" button.
• Highlight your LPL entry in the list.
• Click the "Change" button.
• Uncheck the box next to "Require logon using Secure Password Authentication (SPA)".
• Enter hindmost.lpl.arizona.edu next to "Outgoing mail server (SMTP)".
• Click "More Settings".
• Click the Advanced tab.
• Next to "Outgoing mail (SMTP)", change 25 to 587.
• Under that, select TLS next to "Use the following type of encrypted connection".
• Click OK.
• Click "More Settings".
• Click the "Outgoing Server" tab.
• Check the box next to "My outgoing server (SMTP) requires authentication".
• Click the radio button next to "Use same settings as my incoming mail server".
• Click OK.
• Click Next.
• Click Finish.

Android/Droid

Android/Droid users: see "How do I configure my Android phone to send and receive LPL mail?" for instructions.