Hi there,
Mailman is so old-fashioned as name and man dominated in respect to the gender discussions. It is time to rename it to Mail-Miss, MailMom or Mail-Woman for a while?.
Better neutral: (MailHuman or even:) Mailpeople.
If you de-attach from the "postman" and "running man" probably a "Mailmatch" or best: "Mailme" would fit. (Also Mailmoon and Mailmood are possible).
Words That Start With M | Britannica Dictionary
https://www.britannica.com/dictionary/eb/3000-words/alpha/m
Otherwise add a star to the Mailman* to indicate it stands for men, women and divers people delivering mail, and give a press release.
Otherwise it might be a mailmisery.
Thanks for a change with the next update release.
Regards Tom