If your company has merged with another company, or if your company is changing its name then here is how you get multiple email addresses.
Define a Global Domain Document, mention your primary Internet domain and also define your alternate Internet domains.(These alternate domains will act as an alias for your primary Internet domain.)
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This configuration can be defined from Servers - Domains view of Domino Directory. Make sure that all your alternate domains are configured to send and receive Internet emails.
For example if your e-mail id is firstname.lastname@example.org, If your company Acme has changed its name to AcmeCorp, then you get email@example.com.
Also if AcmeCorp acquires ChairCreations Inc, whose Internet domain is chaircreations.com, then you get an additional email Id of firstname.lastname@example.org.
In the above example Acme is the primary Internet Domain, whereas acmecorp, chaircreations are the alternate Internet Domains for Acme.
So you end up with these may email addresses.
email@example.com firstname.lastname@example.org email@example.com firstname.lastname@example.org email@example.com firstname.lastname@example.org