1: Webmail (e.g. GMail, Yahoo! Mail, AOL Mail, outlook.com)
2: Apple Mail (iOS or macOS)
3: Outlook
4: Outlook Express / Windows Live Mail
5: Windows Mail
6: Mozilla Thunderbird
7: Alpine
8: Citadel
9: Eudora
10: KMail
11: SeaMonkey
12: Pegasus Mail
13: Mutt
14: Mailbird
15: Groupwise
16: Other
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