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Gmail has a nice feature to repeatedly beta-test email sending from a web appliation that requires account creation without having to repeatedly delete the accounts you might have to create to retest. Enter the emails in the following format:
Gmail will automatically strip out the “+1” or the “+2” or the “+3” and resolve the email address to email@example.com. This also works for email domains hosted with Google Apps for Business.
So you do not have to use a bunch of aliases, groups, forwarders or tedious beta-test email accounts.