CMail is described as 'Command line e-mail sending tool. It was originally developed to assist with testing mail server and content analysis software. As a result, CMail provides many more message formatting and SMTP session control options than similar software' and is an app in the office & productivity category. There are five alternatives to CMail for Windows, Linux and Mac. The best CMail alternative is blat, which is both free and Open Source. Other great apps like CMail are sSMTP, mailsend-go, Mailer and chefsender.
Blat is a small, efficent SMTP command line mailer for Windows. It is the SMTP sending part of an eMail User Agent (MUA) or eMail client. As such, Blat sends eMail via SMTP (or internet eMail) from the command line, or CGI.
mailsend-go is a command line tool to send mail via SMTP protocol. This is the golang incarnation of the C version of mailsend. However, this version is much simpler and all the heavy lifting is done by the package gomail.v2
You can send the mails via an smtp server, such as blat, supports authentication and ssl. In addition, he can also send emails via the OWA interface (i.e. the Exchange Server can also be used for external sending if the OWA is published).
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