The best replacement for smartermail is mailenable.

The best alternatives to smartermail are rated as following:
★★★★★  mailenable
★★★  icewarp
★★★  kerio
★★  hmailserver
★★  imail
★★  mdaemon
★  atmail
★  axigen

Your alternative for smartermail is not listed? Suggest!
Speaking about smartermail, one probably shouldn't forget about plesk.

Other search terms related to smartermail and their ratings are:
★★★★★ plesk
You have in mind a companion for smartermail and it is not yet here? Propose!



Google Trends

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smartermail
mailenable
icewarp