Accounts may have a maximum of 9 addresses at Pobox domains. On your own domain, you can have up to 100 addresses on a single account. (You can never have more than 100 total incoming addresses on a single account.) If you are setting up separate accounts, either ones you pay for, or ones you are inviting people to use, there is no limit on the number of addresses a personal domain can host at Pobox.
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