When you say an email address:

Remember that @ is pronounced ‘at’ and . is pronounced ‘dot’: reservations@beachhotelbern.com is ‘reservations at beach hotel bern dot com’.

Sometimes there is a . in the person’s name: jeffery.amherst@britishcouncil.org is ‘jeffery dot amherst at british council dot org’.

_ in an email address is called ‘underscore’: teaching_ job@english_academy.com is ‘teaching underscore job at English underscore academy dot com’.