How to enable forwaring on a mailbox's secondary email address

We have a shared mailbox on hybrid setup that has multiple email addresses as aliases.
now we need to enable a forwarding from one of its additional email address to an external email address.
we don't want mails to be forwarded from the primary email address to the external mail contact.
have already created external mail address as a contact.
Please help me how to enable forwarding from additional email address to the mail contact without changing the primary email address.
Gopi RajuSystem EngineerAsked:
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Take that additional e-mail from the shared mailbox and create a distribution group. Assign that e-mail to the distribution group and forward the incoming e-mails to the external address, as well as, if you need to track the communication you can forward the incoming e-mails to your current shared mailbox too.

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Brian BEE Topic Advisor, Independant Technology ProfessionalCommented:
Can also be done with a rule that looks in the header for the email address.
Gopi RajuSystem EngineerAuthor Commented:
Hello Bocevski,
Thanks for the help but we have decided to create a new shared mailbox for the secondary email address.
If you are using O365 for creating new mailbox you need an extra licence, distribution group is free because it is a simple relay without a mailbox. For in-house exchange creating mailbox is more comfortable if your exchange antivirus does not count licences per mailbox.
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