The best replacement for fastmail is gmail.

The best alternatives to fastmail are rated as following:
★★★★★  gmail
★★★★  zoho
★★★  runbox
★★★  atmail
★★★  hushmail
★★★  hover
★★  polarismail
★★  po box
★  gmx
★  lavabit
★  fusemail

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Google Trends

Scale is based on the average worldwide traffic of fastmail in all years. Click on graph for more.
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