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A domain name, say foo.com, is registered to company ONE. The Address record of the DNS for that domain has been changed, to map foo.com with an IP which corresponds to a server of company TWO. Consequently, foo.com is now hosted to TWO, but the mail hosting is still done in the mail server of ONE. Since then, web access to mails under foo.com is not possible. What server actions between ONE and TWO should take place in order to restore mail web access?
Thank you in advance.