Hello 
,
some data in the list is no longer up-to-date:
Web.de supports attachments with 20 megabytes instead of 15 megabytes.
Mail.de supports attachments with 60 megabytes instead of 36 megabytes.
Unfortunately only 50 emails per day in the free version.
iCloud Mail supports 20 megabyte attachments instead of 15 megabytes.