Logo deos not show in emails.

Hello,

I am a little new to the settings so please excuse me.

I have put a logo in the settings fireld for "Logo URL".

I have a strange problem. If I go to a specific customers emails, and click on one, the Logo does show in the email copy I see in the WHMCS Admin panel.

The Logo does not show in the email received by the customer though.

The emails I get also do not contain the Logo.

In place of the "Logo" is a small rectangle and depending on which browser used it may have a small "x" in a small box. It differs by browser.

If you click on it, it takes you to the main "Index" page for the domain.

The "Logo" does for some strange reason show up in the "PDF" Invoice attached to one of the emails ( No Logo in email.). I think it is processed by a different file and that affects it somehow.

I am not sure if the problem is the logo size, which directory it is in, or maybe even a combination of both.

Can someone please tell me if it needs to be a specific size and format jpg.gif.png, etc.

Also does the file need to be in a specific folder ie: the images folder for "Whmcs" or the images folder for the "Domain".

Also could this possibly be a permission issue?

Thank you in advance for your help.