Our Systems Team has begun implementing the requirement of SMTP authentication on our servers that may affect customers using an email client such as Thunderbird, Outlook or Mac Mail. If you are receiving "550 Access denied - Invalid HELO name" (or a similar error message) in your email client, please check your settings as follows:
From the Menu Bar, Click Tools then Click E-mail Accounts
Select View or change existing e-mail accounts then Click Next
Select your Email account then Click Change
Click More settings
Select Outgoing Server tab
Select the box beside My outgoing server (SMTP) requires authentication
Select Use same settings as my incoming email server
From the Menu Bar, Click Tools, then Account Settings
This will bring up the Account Settings window where you can click on Outgoing Server (SMTP) at the bottom of the list in on the left side of the window. Back in the middle of the window, select the appropriate outgoing server and click the Edit button.
Make sure Authentication method is set to Normal password
Click OK to close the SMTP edit window and again on the Account Settings window.
From within Mac Mail Click Mail, Preferences, then Accounts
Near the bottom of the window, look for Outgoing Mail Server (SMTP), click the drop down arrow and select Edit SMTP Server List...
Click the Advanced button in the middle of the window and make sure Authentication is set to Password.
Click OK to close the edit window
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Thank you for your question. You can certainly set SMTP authentication with SeaMonkey. The instructions should be the same as the ones for ThunderBird.
If these instructions are a bit unclear, you can also view Mozilla's own set of instructions here.