E-mails

or webmail app if you go that route.

Generally, if you receive email from residents, you can just right-click the "From" address and select "add to address book" or "contacts" or similar.

Otherwise, you need to find where you open Address Book or Contacts, then you would Add a New Contact, enter the email address and any other info you keep along with that (name, address, etc.). Save the contact the add the next new one.

You may be able to keep multiple address books or groups inside address books to keep these addresses separated by which property they are at.

Specific instructions are possible if you can tell us what you use for webmail or email client. If an email client, which version. Operating system and version would also be helpful.