The Post Office

I recently had to fill out a form at the Post Office. In it they quite
reasonably asked for an email address and just to get the address correct
they set out a number of boxes so that you could fill each box with a
character. The trouble is that they only set aside thirty boxes to fill out
and my email address is longer than that and I'm not going to be able to
alter that in the time available. Does anyone here have an email address
longer than thirty characters or am I just being unreasonable?