TABLE 7.

Analysis of S/MIME tasks with five MUAs.

MUA	Outlook 2016 (desktop)	Thunderbird	Apple mail (MacOS desktop)	Apple mail (iOS 12)	Maildroid (Android)
Tasks	Subtasks
Configuration	Get a certificate	Get a certificate	Get a certificate	Get a certificate	Get a certificate
	Unzip to get the pfx file	Unzip to get the pfx file	Unzip to get the pfx file	Unzip to get the pfx file	Unzip to get the pfx file
				Transfer pfx file to the mobile device	Install cryptoplugin
	Import a certificate	Import a certificate	Import a certificate	Activate S/MIME.	Transfer pfx file to the mobile device
				Import a certificate	Import a certificate
Mail composition	Write a secure e-mail	Write a secure e-mail	Write a secure mail	Write a secure e-mail	Write a secure e-mail
	Verify if incoming e-mail is secured	Verify if incoming e-mail is secured	Verify if incoming e-mail is secured	Verify if incoming e-mail is secured	Verify if incoming e-mail is secured