Which of these email clients is open-source and highly customizable?

Which of these email clients supports add-ons such as Microsoft Teams and OneDrive?

What tools do you use for email marketing?

When setting up an email client, which of these technical terms would you most likely see?AIMAP, POP3, SMTPBHTTP, CSS, JSCSSH, FTP, TelnetDDNS, SSL, LDAP

'A software that provides delivery infrastructure for email marketing' describes which of the following terms?

Which one of the following statements best describes business software?1 pointIt is the software that sells the business product. It is industrial standard software. A software application that facilitates a business in administering the various aspects of the business.3.Question 3Which of these email clients is open-source and highly customizable?