The IRS has imposed an e-file limit of 5 returns per e-mail address. Now you can use the TurboTax software to prepare as many returns as needed/desired. But after you e-file 5 of those returns, any additional returns must be printed, signed and mailed to the IRS.
I do not know if you can e-file 5 with one e-mail address, and then e-file 5 more for example, with another e-mail address. But I think (don't know for a fact) that per IRS mandates, tax programs produced for self-prepared tax returns are limited to 5 e-files per installation, regardless.
