The best replacement for cdonts is cdosys.

The best alternatives to cdonts are rated as following:
★★★★★  cdosys
★★★★★  cdo
★  smtpsvg mailer
★  jmail

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Speaking about cdonts, one probably shouldn't forget about multiple attachments.

Other search terms related to cdonts and their ratings are:
★★★★★ multiple attachments
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