When comparing PrivMX WebMail vs Sendinc, the Slant community recommends Sendinc for most people. In the question“What are the best ways to transmit sensitive information over the Internet?” Sendinc is ranked 14th while PrivMX WebMail is ranked 17th. The most important reason people chose Sendinc is:
Sendinc allows you to securely send emails and attachments up to 10mb with 256-bit SSL encryption. The messages are then destroyed 7 days later by default.
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Pros
Pro Very easy to install
Easy install and did not conflict with postfix dovecot roundcube system on FreeBSD.
Pro Sends emails securely
Sendinc allows you to securely send emails and attachments up to 10mb with 256-bit SSL encryption. The messages are then destroyed 7 days later by default.
Pro No password to share with recipient needed
Your recipient only needs the link sent not another password to share. Messages are decrypted with an encryption key only available in the link sent to the recipient after they sign into Sendinc.
Pro Android and iOS app available
Pro No download needed
Sendinc operates without any downloadable programs. This is beneficial because it allows you to send secure emails from any computer without needing to download the program again and leaving a trail of what downloadable program you used.
Cons
Con Can't send regular email
This appears to be completely standalone system, only users of PrivMX can send and receive mail from other users with PrivMX. You can't send email to regular @ email addresses, or presumably receive email from them either.
Con Recipient needs a Sendinc account
Sendinc will invite your recipient to create a Sendinc account but if they do not create an account they cannot view the email.