Valid E-mail Address Question

Is Constant Contact able to allow e-mail tags with two dots/periods or more? I have a reliable e-mail address which is a branch of a larger organization. This is not the exact address but the similar format to my question. Let's use the example e-mail of: [email protected] Is this double-dot address accepted? I get the notice that the "e-mail address is invalid"- is there a way to circumvent this?