I am traveling to Oman and I received a visa via an email. Is this a standard practice for visas being issued and do I need to print it and bring it with my passport. Than you

Seems odd I found this You will need to send your actual physical passport, not a copy of it. A visa is a stamp affixed to one of theblank pages of your passport. ... We strongly advise that you send your passport and visa application in a secure way, using a traceable courier service such as FedEx, UPS, DHL, Express Mail or Certified Mail.

I have never heard of that i have a passport book, I would print it out and call the passport office to see if this will work.