Scoured the internet for an answer, all leads don't apply to my problem.

Users with @yahoo.com, @hotmail.com and possibly others don't get a confirmation email or any email generated from vbulletin.

ACP>VB Options>Email Options:

Added the -f (Still no change)

I did a Diagnostic email from ACP and it works perfect to my @cox.net email

Sent a diagnostic to my @yahoo & @hotmail and nothing ever comes through.

This is what comes through to my @cox.net:
You are receiving this email because your email address was entered as an email test at San Diego Photography Forum.

The first step of this email test script has been completed. However, a formatting test is still necessary:

A paragraph break.
A single line break.

Another paragraph break.
Another single line break.
Another single line break.

If the above lines look correct, you are finished. The email features on your server are setup correctly.
If this email is run together on one line, there is possibly a configuration error with your mail server. Please ensure it is configured correctly.

2. ACP>Users>Send Email

Everyone gets the email I generated except for the mentioned email providers.

Is this something that can be fixed within Vbulletin, Is it a server issue?

I have a workshop coming up and I have no way of getting the announcement to those users. (No Wonder why my replies are low to email blast's)

IM Blank, Calling All Experts!!

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San Diego Photos at San Diego Photo Forum and Local Photographers
Talk About music at Rhythm Talk, All Talk about Music.

Sounds like a server issue to me. I dont see a reason why you cant send emails to those addresses..

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GreekRealm
Chat NY