> On Feb 2, 2016, at 1:10 AM, Roman Doe <roman.doe...@gmail.com> wrote:
> 
> Using this can I do the following process?
> 
> If 1...@gmail.com = 1...@mydomain.com
> and 2...@gmail.com = 2...@mydomain.com
> 
> When 1...@gmail.com sends to 2...@mydomain.com (gmail webmail)
> Rewrite: 1...@gmail.com in 1...@mydomain.com 
> 2...@gmail.com receives from 1...@mydomain.com (gmail webmail)

No.  You can only rewrite either the sender address, the
recipient address or both.  In your case it seems you'd want:

    http://www.postfix.org/postconf.5.html#sender_canonical_maps

    main.cf:
        indexed = ${default_database_type}:${config_directory}/
        sender_canonical_maps = ${indexed}sender-canonical

    sender-canonical:
        us...@gmail.com us...@example.com

This will apply to all mail sent by us...@gmail.com, regardless
of the recipient address.

-- 
-- 
        Viktor.

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