Users having email problems with iPhone Software 2.1?

A number of iPhone users are experiencing problems with email fetching following the installation of iPhone Software 2.1. According to a lengthy thread on Apple’s discussion boards, some users find that Mail will only check their email manually, regardless of whether the account is set up to automatically receive mail via push or fetch, and regardless of whether they are using an original iPhone or iPhone 3G. At least one user in the thread claims to have received a phone call from a product specialist confirming that Apple is aware of the problem and is handling it as a “major” issue, although it remains unclear when affected users may expect a fix.