He later succeeded his elder brother Dimitrios (a noted theatrical writer) in running the newspaper Efimerida.

Koromilas activity as the central coordinator of the Greek armed bands across Macedonia did not go unnoticed by the Ottoman government, which demanded his recall.

In 1906 he was dismissed from his consular post, but appointed instead as Inspector General of the Greek consulates in Macedonia, continuing his work until his final recall under Ottoman pressure in late 1907.

During his three-year tenure there he was successful in bringing unity of purpose and cohesion among the Greek immigrant organizations in the country.

[1] For his work in the Macedonian Struggle and later in bringing about the Balkan League, Koromilas was awarded the Grand Commander of the Order of the Redeemer.