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When trying to sign up on some sites my att email address says invalid. I have no trouble logging into email, facebook, banking. This is mostly on new sites I am trying to sign up on. This does not seem to happen on IE.

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This happened on the Virgin mobile website, as well as the Indeed website when trying to apply for a job. Have had this happen other times as well.

This happened on the Virgin mobile website, as well as the Indeed website when trying to apply for a job. Have had this happen other times as well.

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Sites usually don't check whether your address is alive, they mostly check the format. For example, username@mymailsite.com (has @ and a valid domain).

Do you use any add-ons that help fill out forms? If so, maybe clear your email address in there and re-enter it to make sure it doesn't contain unexpected characters.

BTW, what version of Firefox are you running?

Modified by jscher2000 - Support Volunteer

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This issue happens more often than not now. I am typing it manually. I am on Firefox 11.0. This is really annoying. I have started using my hotmail address rather than my att as it is often not recognized.