Comment Why limit yourself, use both... (Score 1) 383
I've been a believer that we need more than one SMTP address. The username version should be limited to username@domain.local however, since you don't want to expose your usernames to the planet through email addresses. Then also have a first.last@domain.tld for Internet usage. If there are conflicts on the latter, I've been a fan of asking the user what they want.
Email addresses are somewhat personal, even if they're work/university email addresses.
I didn't like my email address at work, so I asked to change it. Standards, be damned!