In English there are no masculine or feminine forms. English uses gender specific nouns for male or female.
There is no gender specific noun for a female who delivers mail. Until a few decades ago, females were not hired for the job of delivering mail in most places.
By the time that many postal services began to hire female carriers, job descriptions were becoming generic.
The noun 'postman' has become the common gender nounmail carrier or letter carrier.
Oddly enough, the job of 'postmaster', the manager of a local postal office, was sometimes done by women. The gender specific noun for a female manager is 'postmistress'.
mailwoman
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The plural form of postman is "postmen."
The plural form of the noun postman is postmen.The plural possessive form is postmen's.Example: The postmen's trucks leave the post office at nine AM.
The feminine form of ami is amie. The feminine plural is amies.
The feminine form of bajo is baja. The feminine plural is bajas.
The feminine form of alumnus is alumna. The feminine plural is alumnae.
Baroness is the feminine form.
Mistress is the feminine form of master. It is already in feminine form.
The feminine form of charmant is charmante. The feminine plural is charmantes.
The feminine form for host is "hostess."
The plural form of post office is post offices.