mailprovider test
test 1 mailform2single account => Berkenheuvel@hotmail.com (direct, no forwarding)
test 2 mailform2single account => Berkenheuvel@zonnet.nl (direct, no forwarding)
test 3 mailform2multiple accounts => Berkenheuvel@hotmail.com,Berkenheuvel@zonnet.nl(direct, no forwarding)
test 4 mailform2single account => formulier@berkenheuvel.com => Berkenheuvel@zonnet.nl (forwarding)
test 5 mailform2multiple accounts => formulier@berkenheuvel.com,Berkenheuvel@hotmail.com (forwarding and direct)