unable to send email from my second address (outlook 2007)

Outlook version
Outlook 2007
Email Account
I have a main email account in outlook 2007. Recently added a second email account.

I can receive emails to my main inbox for my secondary email account, but replies to those messages with that secondary email as well as new messages I'm trying to send with that secondary email just hang in the outbox.

I have read about the 'delegates' option under tools-options.... but I don't have that tab available for some reason. Older version?

outlook 2007 (12.0.6668.5000) SP3 MSO (12.0.6662.5000)

Windows 7

I get "verify email address in your account properties" error message when trying to send from that account.

All is set up properly with pop email settings.... my primary email account has been working fine (same server and settings) for years.

Thanks in advance!

Outlook version
Outlook 2016 32 bit
Email Account
Office 365 Exchange
Delegates is only for exchange accounts. Are you authenticating with the mail server? Tools, Accounts Settings, double click on the probme account then More Settings, outgoing server tab. And make sure the address and servers aren't typo'd.

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