The best replacement for openwebmail is squirrelmail.

The best alternatives to openwebmail are rated as following:
★★★★★  squirrelmail

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Speaking about openwebmail, one probably shouldn't forget about qmail.

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



Google Trends

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